I drank the Ego Kool-Aid too! Top rated brand from all my independent research. Not cheap but I have no regrets paying for something I'll likely never have to replace. I have the 21" self-propelled mower, also have the leaf blower and their 2-stage 24" Snow Blower. Batteries for all equipment are interchangeable. The newer electric yard equipment out performs gas power equipment hands down now and is the future of yard maintenance. Virtually maintenance free with no oil or air filters to change and no gas or stabile for winter storage - just insert battery & go! They're even coming out with ride on mowers now for larger properties. I have 5,000 square feet of yard (front & back) and a full cut uses a little more than 1/2 a full battery charge. Batteries charge from empty to full in 1 hour.
They even fold down to a compact unit for storage. Takes less than 30 seconds to fold the thing down.
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Mows the lawn very well and is super easy to use - 1/2 the weight of my old gas mower!
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