Id rather have a cat muff saw then strato junk, im on my forth and last redmax 8001 bp blower. the pistons, i have to put new pistons rings and cylinders in them at the end of every year. either the piston crows cave in and crack, or the piston ring retaining pins shear off allowing the ring to wear the cylinder, or the rings crack, or a combo of all the above. while they r running u hear what sounds like marbles bouncing around. My echo cat 755's arent without their probs. either but r few and far between, the only prob with echo cat blowers is the rings seize to the piston, easily solved, once a year i pull the jugs and re ring the and put new base gaskets, only $15 for that repair versus $120 for the redmax junk....i know these arent saws their blowers but im not a fan of anything strato......all the dealers blame it on low octane, bs cause ive used premium and it still blows them up, now they blame it on ethanol, yet my echos have been running great on 87 with 10% ethanol. and ive been using synthetic woodland pro for 3 years.