I downloaded it yesterday (via same source as you), and so far it seems to work pretty well. There are some windows which do not seem to display a preview properly, but the windows I was most interested in, especially the Internet Explorer ones, work like a champ.
I tried it out a while ago and found it a bit of a pain with VS. It would display 2 tasks for VS, while the regular task switcher would only show 1 (as it should). Perhaps it has been fixed, but it was getting annoying to have to remember to hit tab twice whenever switching from VS to something else.