Saw Runs good, I replaced the crap plastic handle with a full wrap off my 620pw. As well as the single log dog, replaced the chain cover and clutch cover with a pro style ones , once again off my old 620. Tapped/drilled out the spot for the thrown chain catch roller, these 590s are almost 100% identical to the 620, so everything lines up real good, and can be retrofitted as far as I know. Saw is a bit sluggish, but has not been tuned yet, it's factory tuned for emissions, still runs real smooth. Cuts great
The only complaint I have is I ordered the 81 drive link model but recieved some 84 drive link bar, which is ok, annoying as crap, especially since ihave very few 84 dl chains i had to dig them out of my shed, and quit early one day after dulling chain on a tree nail, but it's ok, not upset. All in all it's worth it saw arrived on time and ready to go. No real issues. Went out and made 1200 dollars with the saw that weekend.
84 dl chains are compatible with stihl and husky now. I did order 81 dl bar separately now to use all my old 620s chains. Happy 5 of 5.