I've had quite a few mbps since they were introduced and pretty much each one has either had a defect out of the box, or developed one shortly after I got it. I'm very picky and there are quite a few things I refuse to compromise on, one of which is the display quality. I also hate sloppy build where I can see that it was just some tired, underpaid worker that couldn't be bothered to be careful during the assembly process. I don't accept any defect that could have easily been prevented with just a little more care during the building process. It's Apple's job to get me a high quality computer and I hold them to it. My new penryn is as close to perfection as it'll get: - It has near-perfect build quality with everything fitting as it should. The others I had always had some glitch somewhere: protruding or warped aluminum, strange-feeling trackpad button, unidentified sounds and squeaks, loose battery etc. - The display is beautiful: evenly illuminated, sharp with no color tint anywhere - though it does have backlight bleeding on top and below that is visible under certain circumstances. It's the 9c81, LG. - The keyboard keys are STRAIGHT (unlike almost all my previous MBPs where keys were often unevenly assembled). -It's palpably COOLER than all my previous machines even though the internal temperatures of the CPU, GPU etc are just slightly less. This machine is the first one I feel comfortable using on my lap! It does heat up under intensive and prolonged use, but under normal, mixed usage it's really a lot cooler. I guess this is the result of the penryn chip? - battery life is noticeably better - I have to test it further, but it seems like I'm getting maybe 20-30 minutes more than my previous 2.4 SR. Is this because of the new Penryn chip? This computer is just great. I'm very satisfied and would recommend it to anybody, as long as you're lucky and don't get the yellow screen issue!