So basically, I've had a LOAD of problems with my 2009 MBP, so they replaced it with an i7 2010 MBP 15". Does any of yours lag when you're on the intel graphics card with simple things such as Expose, Magnification in dock, genie effect etc? Not huge huge lag, but noticeable lag, like you can see it struggling to load. Mine does it especially bad in screen savers, even after a new install with nothing running. Apple are refusing to see this as a problem! Please tell me if you have this issue!