Beat this one a while ago. It's ok. Not very long, a bit weird at times, and a step down from the granduer of HL2. Certainly not bad, though.

A thoroughly enjoyable story with gripping characters and a never-ending spiral into madness. It's only about 10 hours, but ever hour is incredible. The puzzles can be challenging, but not overly difficult. The only thing is that some border on tedious, and I encountered a few bugs. All in all, if you want to play this, read NOTHING about it, and play through without looking anything up. It's better this way. I'll probably 100% it eventually.