I would never install a x.x.x.0 release in production unless Tivoli had
categorical proof that it was absolutely solid.  Typically, I wait 3 months
after it is generally available and do some APAR searches to see where the
problems are.  I typically wait until x.x.x.2 or .3 before I put in
production.  Remember everyone is installing the stuff in a test area that
has many TB at stake and verifying the product works correctly before the
deploy to production.  They are the ones generating the initial problems
that are fixed and they do a lot of testing.