Discouragement Encouragement
I completed the first chamber with a cube to spare. And the last puzzle was just brute force, one cube per laser catcher thingy...
Overall a well-made map though. Just not really my style.
VERY beautiful map. And the immersion, and sound effects/etc are amazing. The puzzles were fun (to a point), and challenging... I just, personally, don't much care for laser puzzles, or more preciously LOTS of laser puzzles with a million damn things you have to get the laser through. They can easily become annoying, and just barely misplacing a portal, or cube can totally screw up everything. But I solved it easy enough, so I guess all in all it's pretty good. I did find one area that you can bypass though.
"You can bypass in this area..."
You can totally skip the first part by cleverly placing a portal above the arm-platforms then jumping out and at an angle here's a screen shot of me on those arms:
http://steamcommunity.com/id/rellikpd/screenshot/595815243097380247 (got to think with portals!).
Also some of the door animations seemed a big buggy. (If I remember correctly the one that was most noticeable, was the one that leads you to the final puzzle.
all in all, a good map.
This can't work, because I put a clipbrush there to prevent anyone from doing that. I will look into why it still did it.
Expect an update soon, I have since learned alot about optimizing in P2,so I should be able to improve preformance.
I'm playing custom maps and record my first time of playing them. So the run is not perfect and may not use only intended ways, but maybe it can let you see how other people may understand the map or you could just enjoy someone playing this map for entertainment.
Anyways, here is the recording:
craVVGcyOns
(Link: http://www.youtube.com/watch?v=craVVGcyOns)
Also note the video description for more feedback and my signature for additional project information.
Portal 2 Playlists: videos 1-200 | videos 201-400 | videos 401-600 | videos 601-800 | videos 801-1000 | videos 1001-1200
Visually, a very well done map. Excellent attention to detail (better than the game itself, IMHO.)
The puzzles were a little different story. I've played through the map 3 times in a row, and haven't used the same solution in any room twice. That's what happens when you have lots of targets, cubes and walls. You'd be surprised at all the wacky angles that will work. It's not necessarily a bad thing, since you can easily stumble across a "wrong" solution when you're stumped by the "intended" solution.
I agree with other posters about the cramped spaces, and nearly superfluous turrets.
For looks, it gets 5/5, but for gameplay, just 3/5, so overall, I'm rating it 4/5.
BTW,
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I liked the turret with the "broken neck" and shooting backwards. 
Bit late on the party on this one, heh.
The FPS is pretty bad, getting some huge fps drops.
You don't have to use the jumping pad-thingie in the first room.. You can simply put a portal on the roof and the floor to gain momentum, and put another portal on the floor to fly up to the platform.
And most importantly(?), the doors close too slow. You can get stuck in the previous room, or use it as an exploit to bring items from the previous room. On the last puzzle I ended up with 9 cubes. 
I just finished playing. I liked the visuals, music, immersion overall but the puzzles were rather monotonous - you know, lasers only (well, some turrets too but not much). I know where
(percentage calculation sphere self-test failed!)
108.1% done, -8.1% remaining...
Released here!
All maps for Portal (1/2) worth playing are mirrored here.
I'm quite a newbie and playing these maps just now and so far it's my favourite. I've always loved lasers and there are only a few laser-based maps in the original game. However, the third chamber took about just 6 minutes, while the second was 20 at least. Awesome detail and there's a feel to the whole thing. I would like to play more maps like this.