I have the Black & Decker NST2018 18-volt cordless electric "Grass Hog" trimmer/edger...and I love it!
I first bought this about four years ago and it's still going strong. Growing up, my mom did most of the yard work and we would help out with the mowing. Fast forward a few years (not too many!) and now I have my own home with a yard to maintain.
With no prior experience with any lawn equipment other than a mower and manual tools, I was pretty overwhelmed by the options. I barely knew how to maintain a lawn mower so I wanted something easy to use. The Grass Hog is definitely that! Since it first came out, Black & Decker has come out with new and improved models, but mine still works like new. I don't have much to compare it to since I've never owned anything else, but from what I've seen, it is a winner.
One friend of mine was pulling out his gas powered edger and started spilling gas all over the place. I don't know about you, but with gas prices soaring, I'm glad I don't have another "mouth" to feed. Another benefit it that this is two tools in one. The handle rotates so you can use it to edge (which I mainly use it for) or to trim. The batteries say it takes 6 - 8 hours to charge. If it's been dormant a season though, the power will have completely drained and will take more like 24 hours. My model came with two batteries so I could charge one while using the other. With a full charge, I think the batteries last 30 to 45 minutes. It's been a while since I've used it so much at one time though. You'll know when it's losing power because the grass looks like it's getting a beat down rather than getting cut. From what I recall, the batteries are supposed to be interchangeable with other products in the line. It's really portable and lightweight which makes it easier to maneuver...and no power cords to trip on or accidentally cut! The power is awesome as well. It cuts through grass like butter and because it's so lightweight, I can easily get it into little cracks and crevices. And I've yet to have to change the reel line!
If I could change anything (and maybe it's different on the newer models) I would make the handle fit into grooves on the shaft to make it more stable. I'm too lazy to tighten it down each time I want to change the position. Don't let that put you off though, this is worth the money. I would buy it again in a heartbeat and suggest it to all my friends and family. In fact, I'd love to expand into the rest of the electric line with the hedge trimmer. I find the work less of a hassle now (actually kinda relaxing) than I did way back when elbow grease and spades were the way to go.