After reading about sein's experience with one of the late Betas I decided to give RC3 a try and I have to say I'm very impressed with Coherence, I've not done much with USB so I can't say wether that's improved or not. I don't know wether VMware are going to do something similar, but for me it's a no-brainer choosing Parallels. I've got Vista and Kubuntu running as VM's as well with excellent compatibility.