Don't know how the 2M Dirty Birdy spins but knowing Joe, I expect it will spin at least as well as the 60-size. I flew a OS .91 -powered Dirty Birdy 60 this past season in SPA Expert where the last maneuver was a 3-turn inverted spin. With the right amount of elevator, the DB will give a nice, sharp stall break (required in the maneuver) without dropping a wing until you throw in rudder (with some aileron to get it rotating quickly). It will spin fairly slowly and will break out of the spin very crisply when controls are neutralized with almost no overshoot (1/8 rotation or less). It will do this very consistantly in wind or no wind. My DB weighs in at 7 lbs dry and the CG is at 40% MAC.

I've experimented with the CG and have had it as far back as 55% MAC with no nasty surprises, it just doesn't track quite as well in loops as it does with the CG at 40%. By the way, it definitely knive-edges quite well if it's kept light.