The new encounters are really well done, I think you nailed the balance of increasing the scale of battles without them becoming comical or overstaying their welcome. I was actually a bit surprised at the fact that the marines didn't seem to get in the way in the tighter corridors. I also liked the little touch of them calling the elevators back up after you use them. Everything here was almost seamless, and so far the levels feel legitimately new. I can't wait until the whole campaign's finished.

The only real problem I encountered when playing on legendary -- and I think this might just be an inherent problem with CE -- is that checkpoints can be a little too spaced out. I had to redo a good 7 or 8 minutes of progress when I died in the first fight in a circular room on AotCR.

This is purely a personal preference, but I'd be very interested if you (or anyone really) incorporated some of the stuff from ruby's rebalanced into future updates. Stuff like different behaviors for various marine ranks (especially ODSTs), more weapons, and greater enemy variety would work really well with what the mod already accomplishes; at least in my opinion.