I've been flying a Dynam A10 for a while now, but could not help but tinker with it.
I wanted to extend the flying time, as 5 mins on a 2200 / 4S was just not enough. It makes such a nice noise.
Moving the ESC's into the rear of the aircraft meant I could use a larger battery, and extended the flight time, but the extra weight did put a larger stress on the wings, which I then added some carbon fibre to stiffen up.
All in all, lots of fun but after a year of abuse it's starting to look a bit rough, so I'm looking to try the FreeWing A10.