The upgrade from 4.7 (.65) to 5.0 (.418) went smooth for me. Some apps needs reinstalling (BBM, AOL, etc.). Happy to see free Files included, so I can do away with FileCabinet Pro. Other than that did not see much difference in battery/signal so far (only 24 hours so far).
Wyndtell > Sidekick > Sidekick II > 7230 > 8830 > 9630