We were given both a push and a gas mower when we finally moved into a place with a yard. Personally, I loathe the gas mower anyways, but DH likes it. I would have to second the points of the previous posters: Sticks and whatnot in the grass are a pain, and you definitely can't let it get too long. But otherwise it's great, I figure that's a small price to pay. Plus, it's a half decent workout (we have a hilly yard).
That being said, how the heck to you sharpen the blades? (I shall go conduct a google search, but I won't turn down any pointers if anyone has them!)