I paid about $240 for my FS55RC two years ago. I put a new spark plug in it and checked the air filter last month is the first time anything's been done to it other than adding the gasoline/oil mixture. My next door neighbor's 4 year old $80 Craftman bit the dust. He said it would run, but he broke the starter rope and Sears said it would cost more to fix it than a new one cost. So, instead, he bought a Stihl FS45.
I'm sure there are different opinions, but having a considerable amount of experience with string trimmers; 3 brands of electric, 4 brands of gas, both straight and curved shafts, I can't imagine ever buying one again without the straight shaft. To me they're so much easier and more efficient that they're worth the cost difference. And I guess I'm not alone in that opinion since I've never seen a commercial operator use a curved shaft.