I moved from the Blade CX2 to the Quark about 2 months ago. The transition was fairly easy and natural - it flies very well in the "out of box" mode. It's fast and has authority in all directions but noses up a bit in fast forward flight, so you have to be on the collective all the time. Control suffers in descent, but that's a characteristic of FP helis and is easy to compensate for once you've got some experience. Hovering is a breeze but very different and a bit more demanding than a counter-rotator at first. It's very rugged and mine has come out of some nasty crashes very well. The blades are super fragile (but very safe) so I recommend lamenating them w/ plastic packing tape.

I've just switched it over to the "expert" settings as per the manual and have only run about 3 packs thru in this mode. It's A LOT harder to control in a precise way w/ these settings, but that may just be that I haven't adapted yet. It's all over the place (not for indoors IMO in this mode) and I haven't seen or felt the advantage(s) yet, but more practice and time will tell.

I bought it both as a yard flyer and as a transition machine to a tail belted CP 400/500. All in all, a great heli. Be sure to read the RC Heli magazine review a few months back.

Quarky