I'd be more worried about the crappy recoil, the habit of engine bolts loosening/shearing off, the carb that can't readily be rebuilt and the throttle cable that stretches to the point you can't get full throttle without bending the bracket.
Granted I've run my unit a lot but I've replaced the carb, the strap/harness system, the recoil, the handle assembly and done a full engine rebuild on my unit. I could have bought a new unit for what it has cost me to keep mine running up to par.
I'm sure you will like the power and comfort of it. It definitely moves leaves better than the Echo 770 and the harness system is excellent, but it's expensive to replace.