Be interesting to see what you make of it - I was pretty much continually seeing details I hadn't, and the contrast between light and dark was really marked.
We always go with the director's cut - the robot sentry bits are good and the part where you find out what happened to Ripley's daughter explains why she won't/can't abandon Newt. That said, the couple of early chapters that show what's happened on LV426 always get skipped - it's better not knowing what's coming - even though obviously we know full well.
It looks to me like they've brightened the scenes inside the base. When Newt/Ripley/Gorman are on the ship talking to them via radio, their room is dark, with nice black levels, but cut to the base and it's like the contrast has been dramatically upped. I almost felt like using a darker setting on the TV while they were in the base. This might make you see a lot more if the room itself when they're inside the base.
Close ups on faces were the worst. Any wrinkles in focus in the light looked over-sharpened, and the darker, out of focus parts of the face smoothed. A few scenes had that over-sharpened look, like Newt's tangled hair.
Presumably a result of the over-sharpening, stubble in medium shots sometimes looked odd.
When Newt's family are approaching the ship they found, there's a shot from in front of them, and there was some weird movement going on with the mist - not compression which you would normally see (which makes it look a bit patchy), must just be the way the AI automatically dealt with the movement of the mist, making it look, well, I can't explain like what.
So over-sharpening and faces aside, it did look fantastic. So much detail and texture. But I'm going to watch a few scenes of my Aliens Bluray today to remind me of how that looks while the 4K is fresh in my memory. Might do some quick comparisons.
I hear that The Abyss was the best of the bunch, but True Lies suffered more than Aliens. Unforgivable really, as two of those have never had an official HD release. It's not like they're some lowly film no one would give a monkey's about.
I hear the AI remastering Cameron used was also being used on David Fincher's Se7en. After seeing Aliens, I'm sticking with my guess that Fincher saw the results of this AI remastering and told the studio a big no - hence the huge delay we're getting for Se7en shortly after its announcement.