Larger size = stability, but extra cost for initial setup, batteries, repair and maintenance.

I have three HK450 and one Align Trex Sport and love them. I just ordered an HK500GT because it's bigger . I will be able to tell you it it is really worth the money. It will be a bit noisier (neighbors) and I will need more space to fly, but I can't wait to fly a larger heli... Hopefully I won't crash on first flight.

Gilles