Helibeli, The problem that I'm having is that I only bought the grips and blades. I also wanted to stay with plastic due to its light weight. I forgot where I read this but it was from one of the i-stores that said that these would work with stock e-flite parts. They are wrong and cause of this I believe give exteme a bad name. The guy at bladecx2.com was very helpful and if you ever have a problem just give him a call.
If you got the whole core then is should fly just great. I don't want extended shafts (i just don't like the look). I'm just looking for blade grips.