I brought, and built, one of these at IRW 2004. Unfortunatly, the elements were against me, and I didn't get to launch it there. Well...today was my first day off, since IRW, the sun was shining, next to no wind; so I went out to launch her.
1st launch on a 1/2A3-2: not very high, but enough to assure me that the cotton will burn through, and the blades will rotate.
2nd & 3rd flights on A3-4Ts: both flights the rocket came down 'upside-down'. It rotated very well, and had a soft landing both times, but it descended inverted.
I may try A3-2Ts, next time, so the nose is pointing up at ejection. The A3-4Ts ejected after appogee, so the nose was down.
Good kit though - worth playing with to 'optimise'.