I tried Fusion 4 in 10.6 and it works perfectly fine but the GUI seemed a little bit awkward to me, especially the settings dialog. When switching to Lion however it seems to be making more sense to me. It is very minute though and therefore may just be something that is between my ears.
Fusion 4 is faster with starting and shutting down, even when a vm is still running. It simply does a better job than Fusion 3.1.3 did. The new snapshot manager is also a big improvement from 3.1.3; you can now actually branch.
They have now put everything inside the Fusion app instead of /Library/Application Support/ and elsewhere so you now have 1 central place to go to which makes life a bit easier. Something some people really like is the fact that the network daemons for the NAT and Host-only options will now only start when you start the app. Everything is more like an ordinary app.
The fullscreen option is a hit and a miss in Lion. In Snow Leopard it makes perfectly sense, in Lion not so much. The problem is that it is different from the fullscreen mode in Lion itself. That is also a blessing because the Lion fullscreen mode has some serious issues with multimonitor setups. The standard Lion fullscreen mode only makes sense for people who have 1 monitor. Unfortunately that will be most of the userbase. iTerm2 did a better job at that, it offers both options and lets the user choose in the settings. So you will find angry people with only 1 monitor who feel Fusion should be using Lion fullscreen mode and you have multimonitor people who are jumping out of pure joy because they have proper fullscreen support for their multimonitor setup.
As with any new release there still are some problems. One of them being mice (or things that look like mice such as tablets :smileygrin:). There are some issues that make the cursor jumpy but there seems to be a solution to that problem as well. If you search the forums you'll find the solutions.
I still have to test some more, like taking the snapshots (especially branches) and unity (with Linux) so things might get more positive or a bit more negative. Overall I'm pleased with this release although I still have a couple of things on my wishlist like advanced networking, IPv6 support, better 3D support for Linux so you can use the extra effects and the new Ubuntu GUI and some more little things. I'd recommend Fusion 4.
), it'd probably be best to start a new thread of your own, describing the issue(s) you encountered.
