Just finished it, here's my little review.
Maps looks fantastic, everything is professional, and the ending worth the whole thing.
There are too many pros and you all know it so I'll just move to the cons:
The voices: With such a top quality maps, why using TTS? there are a lot of great voice actors out there and with all the hype you guys got you could get them with no problem, but I guess you used them while no one knew you're existing so yeah..., I think their apathetic voice just killed the mood a few times.
Also, I don't like how you used words like shit and fuck, I mean, I don't have problems with them but I don't think it fits the portal style.
Difficulty: GOD. that was hard as hell. I didn't used cheats and I've manged to beat it, but damn I had a few times that I almost broke my keyboard.
The puzzles themselves are not hard to understand, you pretty much know what to do, but doing it is hard, there are too many ways to die and too many ways to fail while trying to do something.
But my Flash Mappack suffer from that too and I'm admit it.
I just think the game should have been much easier.
That's pretty much the only cons I could find, there are a few more but don't worth mentioning.
Oh and I saw a lot of test chambers that looked almost identical to some of mine, I did got a little pissed when I first saw it, but when I saw I was in the credits everything chilled out.
Otherwise the whole final chapter was AWESOME, so awesome that I played it two times, one after another.
So yeah, you guys totally kicked my map ass, well done!
Looking forward to more stuff.