I've been thinking about getting one for DH, but haven't done it yet. They are cheap ($100-$150), last forever if you keep them sharp, are good exercise, don't stink up the world, are good exercise, and make a nice "clip, clip" sound. They are alot of work to push around, esp if you have hills. We have mostly garden, and very little grass. About 15 steps long by about 10 steps wide, plus the parkways. I would say it would take about 1 1/2 or 2 times as long to mow with a push reel mower. I wouldn't want to do huge yard with one, but for the average house, I think it would be a great idea.
Nan