I bought the 15" (the upper range model with 750M) Haswell rMBP last November, and returned it because I felt that Chrome was lagging when scrolling in some pages (Gmail, for example), and that some UI animations (exposé, for example) were not as smooth as on my Macbook Air. I could not consider shelling $3K-ish on a laptop that felt *less* smooth than my trusty old MBA. I wanted to know: since some time has passed, have there been some fixes to the general UI smoothness of Chrome and OSX since November? Is there still visual lag at the time we're speaking? Maybe it was only a software optimization thing after all. Sharing your experiences would greatly help me, thanks a lot!