I own a Carden 330 and I've flown Jason Cohen's (fastford) Carden 260. Both are very good 3D machines. The 260 is alot more neutral than my 330 though. Both do just about every 3D maneuver you can think of, but the 260 didn't have as much coupling. I really wouldnt worry about 3Dability so long as you don't built it to 48 pounds or something... It's a very capable airplane. I can't really comment on any IMAC qualities because I didn't do much precision when I flew it. Wayne Geffon has been flying his in IMAC and says it an exceptional plane, so that should tell you something.
