I've donated my old MacBook Pro (5,2 unibody) to the mobile development team. I've replaced it with a Dell Precision M4600 with a solid state drive, 16GB of ram, core i7 and various other bells and whistles. This meant upgrading to Ubuntu 11.10 and the new Unity desktop. I was prepared to hate it. Shockingly, I think it is a big step forward for Linux.
dislikes
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Things are still a little flaky, but I expect that will work itself out. In particular swapping between 1 and 2 monitors practically requires a reboot (NVidia drivers). BRTFS didn't work as root partition. Suspend is flaky again and slow to recover. However, these are common problems with they change things radically and I buy brand new hardware. I expect these things will be worked out in a release or two.
Now everything is lightning fast. With 4 cores, 16G RAM and a 128G main drive (I have a normal secondary drive), my complete and utter lack of patience for load-time is satisfied for now.