Is very simple. Is you unit doing what you need it to do now? If so, you don't need Vista. M$ comes out with new stuff to keep its fingers in your wallet. If it ain't broke don't fix it.

I would also wait till service pack 4 zillion comes out. You know M$ always Beta test on its end users after charging for software that doesn't work the first time.

I try to aggravate one person a day. Today may be your day.