Originally Posted by Ridin' Green
The hollow shaft version isn't recommended or approved for the other attachment heads, nor is the extra torque models. I've looked at the RM models, but for the same basic cost I can step up to a much more powerful trimmer in the Stihl line.
This is my observation as well. My old RedMax was as dependable as dependable could get...but, I've not heard as much good about their current dependability as I would prefer. It did not have the power that my FS-80 has, fwiw...though it was close to if not RM's smallest commercial trimmer at the time.