Idahonative
Addicted to ArboristSite
555 is a noticeable jump in power from a 346. It's a small, light, nimble saw for 60cc. All other 60cc saws will be larger, heavier & more bulky.
The 555 will also have considerably less torque than many other 60cc saws which is evidenced by the OP's video. Another thing I noticed was how his MM made virtually no difference in cutting times. You take a cs-590 or 600p, do a MM and tune, and it will put that 555 to shame...and for ALOT less money.