Chris J.
Addicted to ArboristSite
I own one of "THOSE" brand saws (I assume you're talking about the "St***" brand). It accounts for most of the wood we cut every year for our zero-cost heating. It's never failed me. I wouldn't trade it for anything.
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If the 4620 works out, I may look into tweaking it a bit.
Which Stihl model are you currently using?
One thing that will immediately help the 4620 is to run a 16" b&c, then a muffler mod & a retune down the road. My PP4620 came as a AVHD, free, not even a tnak of gas ran through it.