Stability of TSM

[Nelson Kane]

Hello Fellow TSMer's,
I have been trying to postpone upgrading my TSM Server for as long as
possible. I'm a firm believer in "if it ain't broke, don't fix it!", but i'm
starting to get funny errors. Anyways, I'm at 4.1.2, and I have been reading
many issues with each 5.X release. I would like to know, from everyone's
experience, what version is the most stable thus far? and can you recommend a
site for upgrade docs.
Thanks in advance....
-kane