I only have 1 plane from nitroplanes an that is the Polecat 50.
To date I have over 400 flights on it! I used all of the included hardware with no problems what so ever.
The only thing that I changed after a few weeks was the fuel tank. It started to leak.
The firewall, all glue joints seems so be nice an sturdy. Didn"t have to reinforce anything
That said, I could NOT have put this plane together if I was a beginner, the instructions was missing so every step of the build took me twice the time.
My conclusion is: If you have assembled a few arfs before, then it should be no problems.
If you are a beginner, I would have choosen another brand.
Here"s a couple of pics: I used to fly it with a tuned pipe so the cowl cutout is slightly awfull with a standard silencer:P