I tried the latest r14 nightly out on Ubuntu 12.04 for the most part it works very well, hats off to you guys.
Seems faster than 3.5 and svg files seem to be handled better in this version. I like the reorganization of the control panel menus.
A couple of small things I noticed Konqueror the file manager locks up (on two machines and a VM) requiring it to be shut then reopened. Also KLcdDimmer no longer works in this version. If I get some free time I will open bug reports but I am not really sure what to put in for the file manager I get no errors it just stops responding but will let me close it and reopen no issues.