I have a 4mix fs90 and fc95 that havent had any problems with a few years use. I do like the fs55 but it doesnt have the power of the 90. The shaft broke on the 55 in year 3 also after that the cylander scorched up. I bought a parts 55 and fixed it like new.
I wouldnt say the husquarvna are even close compared to stihl or redmax. I had a 326 top end burn out in a year and half of use. My redmax is from 2007 and is running fine.