My flight school (http://www.ecas.com) owns 3 DA-20-A1's (Rotax powered
version) . I trained in them, they're lots of fun to fly. I've heard that
the mechanics there do not like working on them, but can't tell you
specifically why. You might want to contact Adam Harris, the chief
mechanic, to get his impression. I imagine the Continental-powered models
are easier to get serviced since the engines are familiar and don't have odd
features like dual auto-leaning carbs.