
Pros:
Very light compared to a gas mower
A good bit less noisy
High torque from the electric motor. Haven't been able to bog it down no matter how thick or tall the grass is.
Starts within a milisecond every time. Just plug it in and pull the handle back.
No exhuast fumes
No having to deal with gasoline
Cons:
Gotta watch out for the power cord, and you'll need a pretty damn long extesion cord if you have a bigger yard or you don't have outlets around the outside of your house. It's really no big deal if you start close to the outlet and work out.
20" deck is the largest I saw.
Verdict:
Any yard that you would normally mow with a gas walk behind you can mow with this. The only question is do you want to trade off having to watch out for a power cord vs. not having to deal with a gas mower. For our small patch of city it's a no-brainer.
Definate buy.