I bought a clapped out Echo 590 2 years ago.I replaced the burned up piston and put in crank seals, and I think a carb kit. Its always had a problem with idle hang when hot hot.I did the check valve mod to lean out the top end.The thing is, I have wrung the crap out of this saw,and it just keeps cutting.For a 60 cc saw with a 20 inch bar, it cuts almost everything I need it to.Currently cutting 24 inch red oak rounds and noodling the rounds.Fuel consumption is very decent. I cant seem to abuse it enough to hurt it.Good saw I think.Tempted to buy a new one.