I've looked over it before, but it was far too intense for what we need. We've got phpSupportTicket running, available from
http://www.phpsupporttickets.com/ which is very easy to install, configure, and customise, and is very quick too. Depends on what kind of environment you're going to be using it in and what kind of expansion of the UHD you're going looking at over the next 18 months or so.