I own 2 E_Skys and a Hummingbird:

I like my E_Skys but I wouldn't necessarily recommend them. They are not generally part compatible with the Dragonfly or Hummingbird: the servo placement is backwards. You cannot move the battery as far forward either. This makes getting the CoG right damn near impossible if you add a DD tail motor.

The Hummingbird has a great airframe but as for their electronics... I had to send the 3 in board back to Century. I have the E_Sky 4 in 1 box in my Hummingbird now.