I just watched Henning's SA 27:37.. damn that was a sick run. My level-by-level thoughts:
Dam - Solid run, although 1:19ish isn't that hard on a speedrun. I like how you risked the lockshot though.
Facility - Decent.
Runway - I thought SA speedruns would start priming a nade for the battery now. You're the type of person who risks a lot of things on speeedruns so I'm kinda surprised. :P It's not a big loss though, just like 5 seconds or so.
S1 - Decent.
B1 - Kind of bad. If you have a bad cinema you shouldn't watch the entire 2nd cinema, just about a second of it or so. You lost about 3-4 seconds at the first three cameras area. But a few seconds isn't a big deal compared to the entire 27 minutes of the run anyway.
Silo - 1:17 is pretty nice.
Frigate - Normal.
S2 - Pretty good.
B2 - This run looked better than 55 to me.. the first half of the run looked pretty good.
Statue - Haha, nice trevshot. Are you consistent at it? Overall a pretty nice run.
Archives - Kinda meh library room, but you only lost like 1-2 seconds so it's not a big deal.
Streets - Good run.
Depot - Very nice run, especially the TS. Can't you use the normal 43 strat but be a little bit more safe with it though?
Train - This looked alright.
Jungle - Looked alright too.
Control - Overall this was great.
Caverns - Pretty nice run overall.
Cradle - Good you didn't kill the guard below the ramp, he proved to be pretty useful later on. :P Nice run.
Aztec - It's great that you managed to complete a run like this when you probably had a lot of nerves. Outside vent area was pretty intense. :P
Overall it was a pretty amazing run. No major mistakes or stuff like that which is pretty annoying on a full speedrun especially when nerves probably kick in at the third set of levels or so. Not a perfect time, but it will definitely be difficult to beat.
