So, I'm still kinda new to MacOS and Mac hardware, but after having MBA13 (haswell) for few months I kinda got used to NOT have any problems with hardware or M.Lion. Got myself a new rMBP15 (2.3, 16, 750m) few days ago, and on top of buggy/slow Mavericks my trackpad 4-finger swipe (between screens, m.control) randomly stopped working 2nd time already. Fixed by rebooting or unchecking/rechecking swipe options in trackpad settings. I've noticed there are many posts going back to 2011 models with similar issue. Is this another Mavericks bug or a model specific hardware issue? I've never had this problem with Air on M.Lion, and after upgrading it to Mavericks I gave it to my wife, so I can't tell if it'd occur on Air (with Mavericks too). Appreciate any input.