I didn't think it justified a whole new thread, but I did want to append this one to celebrate my MBP's third anniversary!
In the last year I have made a few upgrades to my machine, including an 8GB RAM upgrade (really couldn't detect any difference), and swapping out my 500 GB Momentus XT for a 512 GB Crucial M4 (again, not much of a discernible difference). I also recently got a new battery installed, not because the old one had failed but because it had lost a discernible amount of battery life. The Apple store charged me half the retail price (I think I paid $65) for the upgrade, because my original battery was barely within specs and I still had AppleCare. I have also installed Lion, and moved from using Boot Camp to using VMWare Fusion for my Windows installation. Oh, and I got a new charger (the newer, aluminum kind) under warranty after my original one frayed a bit.
I am far into uncharted territory for a laptop and me. As I wrote a year ago, I use my laptop for hours almost every day, so historically my computers conk out pretty quickly. Three years is almost unbelievable.
I have in no way babied my MBP since my prior thread. I have taken it on several trips but mostly used it around the house. The computer still looks near-new. The only obvious evidence of age is that the bottom is somewhat scratched up, and all the writing on the bottom, other than the serial number, is worn off. As I wrote a year ago, the keyboard is a little shiny but otherwise perfect, and the touchpad still looks exactly the way it did three years ago.
I continue to be pleased with the experience of using my computer, and thrilled with its quality and longevity. Although I am impressed with the new Retina screen MBP, I am not convinced that any of the latest MBA or MBP models is sufficiently superior to my machine to justify the cost of an upgrade. Actually I think what I would ideally want would be a Retina 13" MBA with 512 GB SSD, but since that doesn't exist, I will cheerfully soldier on with my MBP.
I recently built a fairly high-end Hackintosh desktop, but my MBP remains my primary machine. I am thinking of investing in a Cinema Display that I can use with both my desktop and laptop.
All of this is a long way of saying that, for me, three years in, the 13" MBP remains my all-time favorite laptop. This may be my most satisfying purchase of any consumer item, ever.