I have two of them.
Unlike you guys though, I don't like them. Not that there is a saw I like better, just that when I need to use the bigger saws it means I'm getting into bigger wood. Bigger wood is heavy. Heavy is hard. Hard $ucks.
It's usually at the end of a removal I get out the 066. I've already busted my a$$ gettting the tree topped out, chipped, and all raked up. I'm hot and tired. I really don't want to get that big, heavy, hard to pull start, thing out of the truck, much less flush cut a stump, breathing exaust gases while having sweat drip into my eyes.
I also not fond of running to the truck to refill the dang thing after every two or three cuts, just to have to pull on that dang cord three or four more times to get it restarted.
Don't even get me started about climbing with an 066...