I upgraded to LR5 from LR3 on Mavericks and I haven't had any issues yet. What problems did you hear of? I can check if you tell me.
BTW, what problems did you have with Mavericks?
In LR 4 the sliders lost their colors. That's the only problem I have with LR4 after upgrading to Maverick.
Then on desktop when I open a folder that contains pictures,
I don't get real time preview update. Specifically if I have 10 pictures and I delete picture number 2, the file number 2 is gone now. But if I select file number 3, the preview up above will still show picture number 2, which has already been deleted. If I have multiple pictures I want to delete I lose track of what I wanted to delete in the first place very quickly. The only solution is to close the folder and reopen. I find this very annoying.
The most common complain I heard about LR5 is speed. Some people say their mac become super slow.
I just ordered LR5 anyway because it was only 60 bucks. Hopefully my 2 yrs old mac can handle it well. And probably the color slider problem will not be an issue with an upgrade.