we run several rossi's they are in the 2/s class the best allround engines we have, in quality, durability, easy operation, throttle response even on engine sensitive fun fliers we use them and a plus they run only low nitro(cheaper). and last the rossi power!!!.
we have also many other engines like k&b,os,webra,picco,saito, st, tt,sc,asp,moki and magnum and still the rossi's stand out. so to make a statement like this when we have so many good engines.