I have been using this for a while. It is good. It is not a replacement to GNOME Do yet (I am not sure if plugins bridge the gap) but I have found that the application search is much faster compared to the Windows 7 Start Menu.
If the dev is here I have a question/bug report: Every time I reboot my machine, there is a error dialog (with a huge stack trace) that I have to dismiss. I see from the stack trace that it complains about not finding certain applications. I have realized that these applications were on my system when I first installed Wox, but since uninstalled.
Thanks for making this utility though. Makes my life on Windows 7 a bit easier.