Got mine 48 hours ago. Its the 2.3/16/512. Been pumping data into the SSD all day.
Build: No creaks. No problems.
Screen: evenly lit without color shifts. Using it for photo stuff, so I checked it pretty thoroughly but I didn't do all sorts of weird tests like many like to do. I did not check for IR and I am not going to. I plan on calibrating the screen tomorrow; if there are problems, you'll hear from me.
Heat/noise: the thing is dead silent when doing normal work (internet, youtube, word processing) and light photo work. About 2000 photos into updating 7000 previews in Aperture, the fan started going. About 2500 in the keys got pretty warm on the left hand side but the bottom wasn't too bad as far as heat goes. It took maybe 10-15 minutes for anything noticeable to happen. Thats just a guesstimate, so don't read too much into it. As I am typing we are 3000 photos in and the fan just shut off....And just a few minutes later we are done and the fan is off, computer is cooling. For photo work, this thing is fine. For heavy 3D and heavy gaming, might get hot!
Performance: Impressive. I am coming from a MBA and this thing flies. Probably more than I need. It feels very big, so anyone coming from a MBA, this thing is like a boat. No curling up in bed this at a 90 degree angle!
I really like it, but it might be a little big. If you got a 13, you made a good choice as the only thing the 15 has is speed and graphics performance...and its only going to be 50% faster or whatever 20% of the time for most people so it will rarely be noticeable, while the size and weight will always be there. So whichever you got, I think its a good one.
Pages, numbers and keynotes seem good on a cursory glance and use. I read a lot of complaints, but the new layouts are actually quite nice.
I really like it.