I have a 40V Chainsaw of another brand, but wants to utilize my 80V battery collection from my Lawnmower/weedwhacker. This thing has a lot of power and it very maneuverable considering it is 4' longer than my other saw.
This quickly enabled me to take down a dead tree (in conjunction with the pole saw). While the tree wasn't big (only 10" in diameter) this allowed me to quickly and quietly cut through the trunk and cut it into pieces. I was very impressed. I was even more impressed that my battery (4AH) reported almost full power afterwards.
I bought this a few weeks ago and already have used it to trim some trees. It works well and helped me trim a tree that needed a lot of help and helped me take down a tree (in conjunction with the brushless chain saw) in a short amount of time.