Just mowed my lawn for the first time yesterday with this. Very smooth operation and even kicks into high power automatically when it detects alot of blade resistance. The battery life is highly variable though as a result. I wasn't able to quite get my full lawn with 2 fully charged batteries, so I had to go buy an additional 9Ah battery (to compliment the two 4Ah batteries it came with). That should be plenty for next time. Just charge them ahead of time and you won't have to worry about it. Operation is super quiet and it was a breeze to push (it doesn't weigh much at all)!