Im a little let down after returning my 13" TB rMBP. For a 2.5k laptop, I expect at least 8-9 battery life and no lagging in the UI. This feels like the first gen of the rMBP 15" with 650m to me again, laggy scrolling and abysmal battery life. I picked up a SB for 1k with the 940m, and I think I'm going to hold up for the rMBP 13" TB until they refresh it with the bugs worked out. It's a bit disappointing how many issues it has after near 3 years without any solid update.