Before I made a proper install of the Ubuntu 12.04, I had ubuntu 11.10 installed on vmware for quite a long time. But I ended up using it not very often because of a few issues. The most important issue was the lack of good performance...
i agree... performance can be an issue with VM but with good hardware and enough RAM they can run rather smoothly...
one of the reasons why i chose Xubuntu because i find the Xfce Desktop to be quite slick, even in VM... i have tested LinuxMint 13, Ubuntu 12.04, OpenSuse 12.1 on VM (on my G620/4GB) and Xubuntu is still the best... eventhough i can get the Xfce version of LinuxMint i'm quite happy with the elegant layout of Xubuntu



