Long time, 15 years PC user, just bought myself a Macbook 2.4ghz with 4GB DDR3 RAM (Apple installed the upgrade) yesterday. So far migration from Windows was a piece of cake (I'm tech savvy) and I'm thorougly enjoying it - although I did install Parallels with XP as a fallback and for Office.
In terms of the hardware itself, it's surpassed my expectations. The screen is perfect, no dead pixels or uneven lighting. The brightness sensor actually seems to work (just cover the area around the iSight) and see it change the brightness.
Backlit keyboard is handy and nice, although I hate how there are gaps underneath the keys so the light bleeds, makes it look incredibly cheap. Imagine how nice it would look if only the letters in each key lit up. Oh well.
Trackpad works great and being able to "right click" in the bottom right corner is HUGE for me coming from Windows. Makes it much easier to use Windows apps in Parallels.
As people mentioned, the laptop thankfully is extremely quiet for the most part and very cool. It did get hot and noisy a few times but within reason and not to the point where it was annoying or surprising.
This is my first Mac but I've used plenty in the past and performance seems AMAZING - I'm guessing 4GB of RAM may have a little to do with that. Even running XP in parallels and having a ton of stuff open, it only used 2MB of swap...and I always had about 500MB of RAM free. So my HD really is rarely used apart from (launching apps and saving files) since there's no pagefile swapping and everything just runs in RAM!
I don't have the creaky/click noise on the bottom - although Apple did open it up to add RAM so maybe they put it on tighter than from the factory?
I literally have no complaints about the hardware whatsoever which is shocking. Maybe I got lucky?? If I'm reading the serial # right, mine is build week 41 which is this past week?
What are problems people are seeing with these?
So far though, really really happy with the purchase.