Hi Hermie,
No--I keep downloading each new version and tucking it away, but since I am already happily running Parallels, I decided not to mess with changing horses. I did however see a demo of Fusion as compared to Parallels given by Apple reps, and the consensus is, the two products are very close in features and price. There is the occasional unique feature one offers that the other doesn't, but it goes both ways--and each product is still being improved.
Fusion may have an advantage in terms of the legacy of their company and their experience in virtual machines, FWIW, while Parallels is an upstart.
Bottom line, both run Windows well on Mac hardware, and virtualization is the way to go in terms of efficient and flexible computing (why do people still buy PCs and get stuck using only one OS, when you can run three or more at once?).