I've just sold my Durango to a mate, it wasn't because I didn't like it, the car was awesome but I wanted to try the TRF511. In recent months i've had the CAT SX, B44, Durango and now the TRF. The easiest to drive of all was the B44 (with Losi shocks), it does exactly what you want it to do. I hated the CAT but that's down to preference (we didn't suit each other). The Durango was excellent and the only problem I had was leaking diffs (i'm told if you build them right they don't leak ......... I bought the car from Griff so it's his fault they leaked LOL). I sold it to a mate who wanted one badly and got the TRF511. It's early doors yet with the Tamiya but it felt realy good first time out at the weekend so hopefully i'll keep it LOL .
If I was forced to keep one forever it would probably be the B44 because it's bullet proof and does everything you want ............ and above all that it's the cheapest by a mile to buy and to run