The entities that I have dealt with from 2005-2009, which I call "greys" are not at all the same critters that former government employees report interacting with in bases. I will get around to talking about the latter later.

Non-physical greys can be subdivided into 2 categories:

Short Greys: under this category I include not only the formerly most common 4' greys that somewhat resemble the pic on the cover of Communion (a book written by a CIA satanist named Whitley Strieber), but also Lam and other small-eyed greys, as well as the 5' tall variety of large-eyed greys, and probably various other strains of shorter greys.
All these, as far as I know, are now extinct.

They were common throughout most of the timelines of Universes A through F. They resided especially heavily in places like the Zeta Reticuli region, Orion, and Rigel (as did the "Tall Greys"). The short greys were 4D; the tall greys are 5D.
Both classes of greys were as evil as can be, extremely cunning, demonic, astral entities. But that situation was resolved in 2009.

My allies and I waged war on short and tall greys for years, greatly reducing their vast numbers. Then, as described elsewhere, the short greys were turned around from their path by Jessica Schab prior to her falling out with her higher selves and the forces of good. I had thought they were incurably, inherently demonic, but they were totally cured in a surprisingly short time. They turned around completely and fought valiantly for a couple weeks or so on our side.
Then, on the night of Aug. 27, '09, I blogged "Just now i was in bed when a really weird-looking grey comes up. It was actually all remaining short greys in one space, in one skin. It said, 'Farewell, Loohan. You can have what remains of our energy.' And proceeded to shrivel up. I tossed it into my scrubber/storage unit."

Here's something I have not mentioned before about that:
About 4 weeks later I started getting vague images of a shriveled grey-like face, shuddering, wracked with misery and torment. It/they were still alive! Tormented by their evil acts of the past. They had not been able to self-destruct as I had assumed. I would have to put them out of their misery.
I had a heavy heart about that, because they had such a conscience! By that time we had converted many formerly evil species which were now fighting on our side, but none seemed to be obviously suffering from guilt.
I gave the grey(s) to Pa-Paw Shantul to delete. I felt it was the right thing to do. The short greys wanted to dissolve any individual awareness they had, and be recycled back into the infinite. They couldn't live with themselves and their memories.
It was somewhat poignant for me.

Tall Greys: These are a very different, yet in some ways similar species. They are from 7' to 7'4" tall, have the same kind of faces as the big-eyed short greys did. At least the lowest echelon does. They usually hung in the same hives as the short ones. But they are 5D instead of 4D. This was the species that really messed with my dowsing in 2005, causing some embarrassment to myself after I discovered how they were manipulating me.
They were similar in behavior and values to the short greys, but more powerful. They have 99 tiers in their heirarchy, each level being fatter than the one below it, with variations in morphology. The highest tiers are extremely powerful.

The short greys were unique in their dramatic levels of guilty feelings and crippling remorse. The tall greys were unique in that, even before I got around to addressing them with the new therapy (I was doing other species first), I was approached in surrender on Aug. 4, 2009. As i wrote:

Also last night i had an astral visitor who had a face similar to a Lam but with a wider chin and fat face. The entity seemed rotund. Funky vibe, so i bagged him. A 99th tier Tall Grey; high echelon.
Immediately i got the sense that he wanted to negotiate, and was sincere. Riiight, a sincere Tall Grey. Oxymoron.
But he actually seemed to be asking for therapy on behalf of all Tall Greys. So now my 21D self is working with him and them, and i am optimistic we might soon come to a positive outcome.

No other species had the integrity to ask for therapy. The Tall Greys have been enthusiastically fighting on our side since they completed their therapy.

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So, there are no longer any non-physical evil greys left, that I know of, anywhere in any universe or time-line.

But, the so-called grays that you read about that people have interacted with in government bases are something else entirely. The following is excerpted from my blog entry of Jan. 24, '10:

Very interesting. I was just looking at a page on Project Camelot that i hadn't looked at before. It has this pic of a "a classic representation of a Gray". But this is absolutely not a likeness of the common 4D short greys that i am familiar with. These latter are now extinct by their own volition, because they could not live with themselves, so repentant were they once cured of their extreme evil tendencies. As i have suspected, these physical "grays" referred to by former gov't people are a different species entirely.
I have a clear idea of what the classical short 4D greys looked like. Because last year as i reported, one of their messengers had to get my attention to let me know they had found another mantis hive, and were attacking it (this was not long after they had switched sides). To get my attention he made me see his face very clearly for a couple minutes. I have not found a pic of exactly that face on the web. It was rather good-looking in its own way.

Anyway, these physical greys have a base on Jupiter's moon Io, right about where the square dot is here. That location might be slightly off; i had trouble zeroing in on it. They are evil. The depth is 223-311'. I think there are 3,111 of these ETs living there.

Their home base is ESO 69-6. Pic to the right.
Which is interesting, as in the past i think i have read that the "grays" of gov't collusion come from the same places where the 4D greys were common, e.g. Zeta Reticuli, Orion, etc.
Was this just a subterfuge because these "grays" wanted to obfuscate their real location?

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Then there is another life-form that resembles short greys. These have been publicized by Dan Burisch, who called them J-rods, but J-rod was just a name given to one individual by the government. Dan seems to think they are the same thing as greys. J-rods are mutant humans from the future who have been heavily into time travel/manipulation. Some were good, some were OK, but a great many were very evil and dangerous. However they have accepted therapy, and the status of the evil ones is still "in therapy" months later. I believe they are refraining from evil and will turn out OK.

I am a bit confused by their degree of physicality. Dan makes it sound like they are physical, and if they are future versions of us, one would think they are physical, unless we all ascended to a higher dimension or something. But I do not get a vibe off a particular dimension like I should if they were strictly hyperdimensional, non-physical beings. Yet I have only interacted with them on an astral level, including jailing vast numbers of them.

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Then, too, there are still vast numbers of evil (as well as likely some good) humanoid species that may resemble greys in appearance to one extent or another.