Wait if you're thinking of buying
If you're thinking of buying Fusion, wait until some more people have posted their reports of the 1.0 release. In fact, you might want to wait until the 1.1 release.
I've been using the RC1 for a few weeks and while it's stable and hasn't crashed, the coherence/Unity mode isn't bug free. Additionally, there are often a few moments of lockup (when quitting Fusion, for example; new programs can't be launched for around 20 seconds even though Fusion no longer appears to be running). This is on both a 2GB MacBook and a 2GB iMac C2D.
I've reported these bugs but was brushed aside, with the support staff saying they're unique to my systems. From what I read, the 1.0 release only fixes a handful of "major" bugs to do with crashes, and applies some new artwork.
Also, if you buy in the UK, be aware that you'll be taxed for VAT but you won't be told about this additional charge UNTIL AFTER you've clicked to place the order. I complained about this, which is illegal in my country, but they never replied to me.