I have both at the moment - the base 2.2 Iris Pro and the 2.8 with the 750m. Decided to stick with the base model and return the 2.8. I never play games or do hefty video work so the Iris Pro is fine. The 2.8 runs hotter and the fans are more noticeable. Geekbenched them both - 13100 v 14500, which is actually pretty good for the 2.2. The only downside is the smaller SSD - but I'll get one of those 128GB SD cards from Transcend to open it up a bit until third-party options appear. I guess the point I am making is the base model is pretty fab value for what you get and what you pay - and certainly none too shabby when run alongside the top end model.