Great concept, but not ready yet.  I like the machine when it operates well, but it needs as much attention as my former gas mower. For example, the blade is constantly loosening, even with their special tool and I need to tighten it a few times a mow.'

I would be okay with a bit of extra attention to the machine, if I didn't have to buy my third battery in 5 mowing seasons (with light use) at $100 each.   If you're an environmentalist, consider what the environmental costs are of producing and disposing of these batteries. If you're concerned about $, you'll pay quite a bit more for the machine...