I just finished building my first combat wings slope soarer. It rocks. I didn't do a very good build but the lightest of winds keep it flying.
I thought the Kit was not that great of a deal and the instructions were horrible but they make a really good airfoil for slope flying and with the heavy winds I get from the Bay Area fog the Mini XR stays aloft for ages no problem.
I had a Zagi for a while. It was the most fun I have had flying RC (gas, electric, or glider). It flew great and put up with a ton of abuse! The spar finally gave out during a fight, though.
I need another one!