I have the $1399 model and while it is great for using fcpx and other productivity tasks, it is pretty bad at games. I tried playing WoW at native resolution and at fair graphics settings the fps was 22 in the starting blood elf area on average. If i dropped the settings to low and minimum and the fps went up. If you are wanting to game on the 2015 13" rmbp, you should be aware that the iris pro 6100 is still not quite up to par. I would suggest waiting for the refresh of the 15" models.