I built mine stock, and I like how it flies. I was a bit tailheavy to start with and it climbed (alot) on knife edge (both ways).

Got that right and it flies very good.

My only complaint is that it is quite fragile. I can make a nice soft landing and yet something seems to crack or come loose. The foam is very brittle, especially in the cold. About every 3rd flight I end up repairing something.