I got a Lee box after originally seeking an AGR. Mike at Muscle Rodz gave me a quick education and then Mark at Savitske Classic & Custom talked me through a lot more detail on several of the brands/options (
http://www.scandc.com/leesteering.htm). Both of their advice seamed to be validated by searching this post and others. Subsequently my friend also bought a Lee. It'll be a little bit before I'm on the road with it but I will say the feedback I have found has been good.