Borrowed my neighbour's Fiskars "Staysharp plus" push mower over the weekend. My lawn has never looked better. I'm not going to say that it was as easy as the gas power mower, but i could stand to lose 20 lbs.
I had a reel action gas mower years ago and really liked it, but this Fiskars gave such a great cut I'm scouring Craigslist and doubt that i'm going with a battery after all.
Just wait until you hit a rock and chip one of the blades on the push mower. It'll stop in it's tracks and you won't be able to get them to spin anymore. I had one for a year or so and hit a rock and it totally messed with the whole mower.