I wanted to hit up the midnight release last night at my local store, but was prevented from doing so... which was probably good. If I'd started this last night, I'd have gone to bed at some ungodly hour and gotten nothing done today that I needed to. It's really compelling.
Worth noting for those who haven't jumped in yet: you have three pretty considerable audiovisual options you might find worth considering. Firstly, you can play the entire game in black and white. The color is great, so I'll probably reserve that for my next run through it, but if you're a big film noir guy like myself, you might just find that more fun. Secondly, you can change the investigation music options. It defaults to removing instruments when you find key evidence until you eventually hear nothing, indicating that you've exhausted the physical evidence at a scene, but you can change it to just stay on so that you never quite know. You also normally get a little chime and maybe vibration when you walk by evidence at a scene, and you can turn this off as well. I immediately did so to play up the actual investigative nature of the game, which is one of the main reasons I'm loving it so much. I think it was a good call to include the options, but also a good call to let you turn them off. They don't really feel as bad as big hints, but I'd rather really work for it, and never be quite sure that I found everything.
Anyway, great game, anybody who hasn't picked it up, get it!