Are you guys talking two stroke weedeaters? I ran a small engine shop for years and sold Echo and Stihl. My personal garage is full of Echo equipment that runs flawless.
Stihl chainsaws-- Use a plastic oil pump drive gear. They also use a plastic lower end crankcase. Similiar to Poulan, Homelite and all the cheezys. Your 10,000 rpm crank is sitting on plastic. If it gets a little warm its game over.
If I was going to go buy a new trimmer for the house it would be an Echo SRM 210. Im assuming they still make that model. I sold my half of the shop in 2006. Back then they were $199.
Generally speaking theyre all pretty good. This is the ford chevy dodge thing of yard equipment.. Keep them cleaned up. Run good oil that wont carbon the exhaust port. Dont expect a mower to do what a tractor does, dont expect a tractor to do what a dozer does, dont expect a dozer to do what dynamite does kind of thing.