I would imagine the new gen 562s have had the autotune stuff ironed out. I believe I have seen similar thoughts posted by folks on here. However, if you are not wanting to replace your 455 then looking at a 372 (or something of a different flavor in the 70cc range) would cover more ground with your saw plan. I agree with the above comment on the rancher series of huskys being quality products. My uncle has a 450 rancher with what seems like a billion tanks through it. Thing has been beat up and still runs well.