We tried a Shindaiwa a few years back......I don't know if they've changed since then much, but that one was a POS compared to the Echos.
Sounds to me like that is one of those "I heard stories" and not hands on experience. Calling Shindaiwa a POS is pure BS, try telling the truth...
Years ago I had my own lawn service business. I ran nothing but Shindaiwa stuff. After all the use and abuse I put them through I still have the same ones I started with. (I used these for two years commercially before getting out of the lawn service rat race) They are all at least 5 to 6 years old now, and the only thing I have ever replaced was the trimmer head twice, and that's more because I wanted to try a new style, not because it was torn up. BTW, they are currently used to trim a 3 acre property weekly, not just a city lot. Check out the edgers they make too. You can literally run behind one if you really needed to.
OP my advice, watch and see whats on the Lawn Service Trailers you see running around. It sure as hell aint Echo, you'll see a few Husky and Stihl's, but the vast majority will be Shindaiwa.