Theres a good supply of bj4 worlds running in the UK, and they are VERY popular over in the states. I've tried both, and i love my bj4 worlds.. it feels as though it is always on rails, i had a few issues with it indoors, due to lack of practise on the obsticles i was on - later finding out i was on 2wd due to stripped front hexes!!
Outdoors it is a very good car however, very easy to drive fast, stable and consistant.
My x-5 was nice, i enjoyed racing with it, it was really easy to race but the downside for me was the price of spares for it.. £15 for a shock tower, £15 for wishbones.. all abit shocking really.
The bj4 is competitive with abit of initial tweeking to suit our tracks, spares are cheap enough (nearly half the price of losi !!) and it is a very efficient car with its shaft drivetrain, and sealed differentials. It also looks like CML have taken interest in the car for 2007 with some of their drivers running the cars again.
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