We got one when we moved into our house last year because it would have no/low maintenance, be quiet!, and it was better for the lawn. I spoke with my friend who had bought one on the other side of the country and we agreed we had similar size yards, so we were astonished when it took us significantly longer to mow our lawn (about 6x), which was frustrating for DH. When we visited this summer while out for a wedding, we realized they may have similar sized lot, but the yards to mow were not the same because they had a scrubby hill (no grass) and gravel side yard. Ours was also on a hill which makes it harder to mow.
In general, it's been ok, though it takes longer than we thought it would. DH ran over a branch once and had to readjust the blades though, and it's never been the same cutting the yard since then he says. So having lots of branches around might not be great.
In reading up on them it seems the quality of the mower really affects satisfaction so we went with fiskars.