Upfrading OSs then going back if you're not happy is a fairly easy thing to do IF you follow the instructions to the letter. I went from 4.2 on my Pearl to a beta 4.5OS. Never had a problem. I have since gone to a few official releases, and now am running a beta again. Other than a few odd quirks - such as occasionally slowing up - but nothing a battery pull doesn't cure.
I say go for an upgrade. If you don't like it, you can always go back.
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