Biggest problem I've had with the Robarts is the 'scissors', or links as Robart refers to them as. These are easily bent out of proper shape by a slightly hard landing, and I don't consider them to be repairable. Best to stock up on spares, as another has suggested. I have the CJs also, and despite the problems with the Robarts, I prefer them (Robarts).
Robart could cure the problems by making thse links stronger, either thicker metal or stronger metal, maybe sprnig steel, but they turn a deaf ear to our complaints and gladly sell us spare parts.
My (Top Flite) Corsairs weigh under 9 lbs, with retracts and flaps, so don't etch that 10lb figure in granite.
See my gallery for pics of my Corsairs