I'm really starting to like battery power! I also just recently got a black+decker weed wacker/edger. That thing is great! Just pressing the button and it works...means the difference between me edging my driveway or not (coz I'm too lazy to mess with my gas weed wacker). It uses same battery as the hedge trimmer I already have, 40v, so I only had to buy the tool w/o battery and charger. It was only $65.
I tried out the worx saw the other day. The wood blade it comes with kinda sux, so I ordered 3-pack pruning blades off amazon.