I don't personally know about the cordless ones but the guy I use for tree work has a handful and speaks highly of them.
As for corded electric - Mrs. Geno wanted a chainsaw but couldn't crank one so I got her the cheapest 12" worx brand from one of the big box stores. My limb saw wouldn't crank one day so I started using that thing to see how long it would take to kill it. I had 20 tonnes of water oak on the ground at the time. It made all the small cuts for those 5 100' tall, 48 dba trees. I started buying good chains by the ten pack for it. Last summer I had another one of those massive water oaks put on the ground and a live oak about half that size. It's made all of those small cuts as well. I have no idea when it will die. I put my limb saw back in the dark corner of the shop and only use the husky rancher 455 when I need big cuts made. That 100 clam 12" worx handles stuff up to about 18" like it was made for it.
