Its nice, but occasionally Cinnamon seems to grab the CPU and take a huge amount of resources for no apparent reason.
Maybe that explains why Mint 15 Cinnamon is so slow for me. 13 works fine.
Is it the nemo file manager? under some circumstances, nemo starts to hog memory and CPU. It has to be killed. It will restart ok when you open the file manager again. Aside that annoyance, all has been working fine. I don't recall exactly but it is a known bug in 15, so I expect it to be fixed in 16.
Nothing wrong specifically with Mint Cinnamon the only thing I can remember bugging me was the mintMenu being slow to show up after clicking it. I do enjoy messing with a different OS every now and then, XUbuntu actually stuck for quite a while, might be going back to it too, but I installed Mint XFCE yesterday (after trying ElementaryOS for a little bit) and it seems to run quite nicely on my AMD-E450 APU 11,6 inch net(ish)book