i have a husqvarna 600c with a robin on it i love it it has been extremly reliable and robin's service has been great too! you can call robin america at 1-630-350-8200 and talk to tech's,engine designers,and engine testers.i can tell you that the engine parts are heavy duty like the air filter is metal and paper and does not flex when tightened down ,the gas tank has a filler screen to catch foreign particles,the oil dip stick is metal too,the pull rope seems to be thicker than most and it has a fuel shut off under the tank.i guess the only complaint i could have is that the oil stays clean and clear even under harsh conditions and when first changed its really hard to see on the dip stick!snapper also has a few models running this engine so you could buy your air filters and oil filters from them if you need to.:dizzy: