This is a great push mower. Our grass was 2 to 3 ft tall this first mowing, We had not had a working Lawn Mower before this arrived. Our lot has about 1/5 Acre of grass coverage, so I was planning on splitting the lawn in half and cutting it over the course of 2 days. Even with our grass being as tall and thick as it was I only had to break the lawn into 3 parts. Over all this mower did very well, it did not bog down any more than a gas powered mower even in the thickest parts of our lawn.
I purchased the 1000 model in 2000. It stopped working 8 years later. We took it in to the authorized service center and they overhauled it for free. There had been a recall on that model. They installed a new charger and a new deck and effectively upgraded it to the 1200 model. I bought new batteries (recycling the old ones) and a new blade and it now runs like new.
Electric mowers are nice, no gas, no oil, no maintenance, quieter, cleaner... They are great.
The mower works well enough. For our 1/2 acre lawn it can sometimes run out of juice before we're done, but if we don't let the grass get too long, it's generally not a problem. We just finish off the lawn the next day or so if it runs out. It does a good enough cut, either way.
This mower works as advertised. If your lawn is small (like mine), you'll be able to bag (and compost) or mulch to your heart's content. The battery works great, because I'm not dragging a cord around the lawn. But, I'd be wary of the short battery life if I had a large lawn.
And, of course, the greenest of all lawn mowers is a traditional reel mower.
(Note: I purchased this mower refurbished from a Black & Decker outlet.)