Summary: I enjoy using a cordless trimmer since I have a large backyard. The line changes very easily and it is a powerful tool. Even my male friends ask to borrow it. The only problem is that after 10 - 20 minutes the top gets heavy because the recharger is located on the handle. And, it isn't designed to hang up very well.
Summary: I purchased this for cutting small trees, instead of a chainsaw. The saw excells at cutting small logs, there is no kickback, its light and quiet. With the two batteries fully charged it will cut wood longer then I can, and I don't have to put up with the oil, gas, and smell of a chainsaw, not to mention (again) the noise. I use it mostly to cull dead trees off my property, and to cut them to length for firewood. again it works great.
Pros: Lightness, ease of handling, power, portability, safer then a chain saw
Cons: An allen wrench is required to change blades.