I installed this as a vertical menu without a theme. It works well after I got done tweaking it. It was meant to be a horizontal menu; vertically it's a bit of a pain. The markup is ridiculous, as my menu is nested inside NINE (arguably unnecessary) tags: a list, three divisions, and a table. Add to this the use of inline CSS (a bad practice in general) which requires the use of the !important modifier, hindering accessibility. This and other issues made it took longer than it should to get the desired appearance.
But it works well, with good animated effects, and it's not so bloated that it noticeably slows down the site. I'd recommend it with the above reservations, and hope that the output gets cleaned up in version 2. You can see what I did at http://kpfz.org .