No troll (promise!) but after feeling very frustrated with sluggish behavior, weird glitches, continuous beach balling with 10.9.2, I decided to just downgrade to ML. Ahhhh! It was like taking a breath of fresh air. The odd thing is, my laptop felt sluggish in general, even when booting to SL on an external HD, but the instant I removed the Mavericks partition, my laptop immediately sped up. It was really weird (because what's on one partition shouldn't affect another), but it was a relief. Plus, I was about to do an in-place install of Mavericks to hopefully repair the OS - the installer said it'd take 50 minutes! ML, on the other hand, took only 20 mins! It's weird. I'm not usually one to advocate downgrading - I always want the best of the best, but Mavericks truly has been perplexing. I tried everything (Onyx, repair permissions, installing the combo updater vs. delta updater for 10.9.2). Sometimes the OS worked normally, but there were many moments where there was erratic behavior, sluggishness, and just oddities that was hard to put up with. I've been putting up with the OS since October, and it was getting worse and worse. Since I've gone back to ML, so far (knock on wood!), it feels SO good to have fast system performance back, and ML has been humming along smoothly. Seriously, ML feels like the 2nd SL. I also feel good having those back: a) Console window that remembers its positions b) Time Machine that stays at the folder you request it go back into time - vs. Mavericks, which switches to your Home folder instead c) Much smoother Time Machine starfield experience - Mavericks was choppy and sometimes missed windows while going back in time d) Instantaneous WiFi connection after waking up from sleep e) Faster performance, no weird, random lags Don't mistake me - Mavericks DOES have potential to be a good OS. However, I think it's one of the buggiest, most sloppiest versions of OS X to be released since Panther, Leopard, and Lion, and I would prefer to wait until 10.9.3 is released to see if those issues are fixed. If no go, then I'll probably just hold out until 10.10. Moral of this post? If you're having frustrations/issues with Mavericks, downgrade to ML if you can. There's not *that* much of a difference between ML and Mavericks, with the exception of iBooks/Maps being excluded, and some apps (iPhoto/iMovie/Aperture/FCPX/iWork) require 10.9 (the latest versions, anyway). Curious if anyone else had similar positive experiences downgrading to SL/ML?