I have the precursor to the 311, the MS 310.
A 20" bar with a chipper chain is about all this saw wants. If you stand on it, it will bog down. I have been happier with mine since putting on a 18" bar.
My 310 is 14 years old and has cut about 12 cords a year since I bought it. Replacing a fuel line ($5.00) has been the only work it's needed outside of normal maintenance
