Personally, I never liked coherence. And until this release (5160) I thought it was not as good as Unity on Fusion (not that I used Unity all that much either). That being said, I think that coherence on build 5160 is better than Unity on Fusion build 51348. Sure there is a little bit of streakiness (drag a window with a mouse rapidly), but it is much better than Fusion. Might depend on your set up though. The earlier v.3's were a mess for me, but this one seems to be much better. Good CPU use. Doesn't hang up with sleep (as far as I can tell to date). And no loss of performance over time that requires a reboot. These last two were noticeable for me on my Macbook (1st gen) with Fusion. Austin P.S. I wonder how many of you with problems use it with bootcamp? I've never done so, and I've never had serious problems (except for the v3s until now). I also wonder how much of these problems that are found in both Fusion and Parallels are platform specific (i.e. to the particular version of Mac being used to build code).