After having 5 different models of them, including a 661c, no more mtronic. No autotune either. Big thing that sucks about Stihl is their stupid expensive pricing on their full wrap handles, and sprocket covers. Husqvarna has the market cornered with the 40 dollar full wrap and big dawg package, then the cheap clutch cover package option.
I have to drive over 125 miles one way to get to a local dealer that won't turn down working on either a auto tune or mtronic. I will not be part of that cluster...... any longer