The problems I ran into were that I have so many overrides in place that it took me a while to sort out the conflicts (self-inflicted). I also was not able to configure a 3-deep megamenu from just the main menu itself, though creating and loading submenu modules works - a fifth star if this extra feature ever finds its way into this very fine plugin.
A couple other nice plugins and themes on their website, too.
Thanks for your nice words. Feel free to use the forums for any technical difficulty:
It works entirely from the front end (wish list: back end access, please, to tickets for administrators, since that's where they're usually working anyway.)
Four-and-a-half stars, really good. I'm nicking it a little because the configuration is a touch below par, there is no online documentation, and there is no 3.0 version (but they're working on it).
well done. wish there were more stars. this plugin deserves 10 **********'s