Theres loads of threads on drifworks about these.

One fella says who loves rotarys that they will outlast any piston engine if well looked after and maintained in performance motorsports conditions. And when mapped right they are actually more economical than a piston engine in motorsport conditions.

But then some fella who love piston engines sr's rbs etc will tell you the exact opposite that rotarys are unreliable, uneconomical (which they are for road use ) etc etc.

So your never going to get a straight heads up opinion.