I am using VM for a while now, most of the time to
have alpha, ctp, beta…

My issue was that my main VM was starting to be
really big: 8.5Gb and I had to do something to save some disk space.

Some weeks ago I read about InVirtus VM Optimizer 2.0, and this weekend I was
able to download there 14 days
evaluation version. Installation was so easy and the result is that now my
VM is 5Gb and loads faster. Great tool!!!