Got a 6100 in late April. From the first cuts, even adjusted quite rich, it was impressive. Lots of power on the top end, and very broad, flat torque curve. Almost impossible to bog it, except jamming it into black locust with full 20" bar engaged, noodling. It's more than sufficient for anything I need for serious firewooding. Clutch cover design is excellent for clearing chips while noodling- really nice touch.
It's so powerful, I got a 24" bar for it. Eventually it might have a 28" handy, skip-tooth of course. Yes, avail in K095 mount. Might have to try an 8-tooth rim sprocket soon. Easy to swap from OEM 7-tooth. That might be more practical than 28".
Once I leaned it a bit on the top end, it's fuel endurance is amazing, with 27 fl. oz. tank. Still a bit rich. No rush, just don't want to build up any deposits, and start fires.
Awaiting your eval.
I forgot. After a couple of tankfuls, I hooked up a known-good compression gauge. 215 psi. One of its "speed secrets".