[Watabou]

What bugs have you found? Have you reported them to Apple?

I haven't found any since the 10.9.1 update. They fixed the quicklook slowness bug which was my only complaint. Mavericks is one of the most polished OS X release I have used, behind Snow Leopard.

[protomyth]

(not op) I have 4 reported to Apple about Mavericks and one (Quicktime) was fixed with 10.9.1. The other 3 are on the Finder, first appeared in 10.9, and were not fixed in 10.9.1. Mavericks has the buggiest Finder I have seen on a 10.x release. It is a pain to have to restart Finder multiple times a day.

[Watabou]

I would agree with you if Apple hadn't released 10.9.1, but honestly, Apple has fixed the Finder issues for me.

Quicklook is still slower compared to Mountain Lion for me, so I hope they make it faster still.

[protomyth]

Move some picture files from one folder to another with preview item on and watch the finder hang after about twenty files. It is damn near unusable at this point. I gave up for big sorting and just have a button on the finder toolbar that opens a terminal in the folder the window is showing and do copies that way.

[_delirium]

I have a weird issue where, after upgrading, opening the Activity Monitor causes a process called 'systemstats' to balloon to >1.5GB memory and peg the CPU. Doesn't seem to be just a startup thing, because it does it indefinitely until I kill the process (closing Activity Monitor doesn't fix it). Googling around turns up some other people with that issue but no obvious diagnosis.