Mono and keepass has been working great for me on linux, you do have to install a few extra things to get it working on ubuntu and xdotool with a higher version than is supplied by 10.10 if you want autofill.

I am seeing buggy behavior on Ubuntu- the File drop down isn't droppping down. It also won't import my version 1 db, telling me that must be done from Windows.

I will probably stick with KeePassX- there isn't anything wrong with it and none of the Keepass version 2 features seem look like game changers.