The only thing that upsets me is the price drop in the 15" refurb. I bought mine at the end of January (so I'm outside my 14 day price refund guarantee).
Otherwise, I love the machine I got. I probably won't use thunderbolt (can't I still call it light peak?) since I have a PC desktop that I have to keep compatibility with (USB 3!). The nvidia graphics card is awesome and does everything I want it to do, and has CUDA support if I ever choose to use it for anything (been considering this). I plan on upgrading the RAM myself to 8gb once I need it, and I planned on getting a Momentus XT (once the issues are sorted out) anyway, so I would be upgrading the drive no matter what model I had. That or do an Opti-Bay SSD+HDD, but that will be decided at a later time.
Overall, the only change that I've seen the might affect me is having two extra cores/4 extra threads. But shaving 3 sec off compile times doesn't justify the extra money I would have paid 🙄