Funny the cheapest Echo SRM210 turn out to be one of the most durable and reliable trimmer. My HC151 I got 5 years ago turn out to be the most reliable one. You can say all the reason why they are cheap, inferior features and all, at the end of the day, they last and get the job done.
I don't use the HC151 anymore for hedging only because it is too short for my back. And at that, I use it as dispossable to cut branches to compect the stuff for recycle. And it has been holding up, you are talking about cutting branches up to 5/8" and piles of it!!! They sure did something right with that 21cc engine!!! On paper, single ring, two bolt cylinder, those are Craftsman's signature!! But........................