I just get a vibe from many people it's still buggy so perhaps wait few more months for a newer version of 2014?
Disclaimer....Just My OpinionTotally your call but if you do decide I would elect to do the clean uninstall method.
Yes, I know a lot more cumbersome than hitting the GUI but I think worth it.
FYI, I have not upgraded yet....going to wait for next code release, keep reading the forum, then try on one of my W7 64bit machines.
But...I am very conservative guy too.