The battery expanded so much that the trackpad barely responded at all. I had to press it fairly hard to even register a button-press. And then the haptic-click felt about 1/3rd of when it was new. Everything works great right now, but from what I've been reading, they replaced everything with the same exact parts. So I should expect the same problems to pop up again. I am going to wait to see what Apple releases as far as Mac goes and then I'll sell this MBP and hope they solved the problems with the newer models.