There are other reasons I didn't pick powerwalls: self control/programmability, integration with Solar to create a micro grid which is what I have, installation cabinet instead of on wall, depth of discharge/charge cycles, and other factors that weighted into my decision. Granted some people are happy, but I was looking at will this battery still serve me in 20 years and give me a better payback. Tesla is very coy about the battery chemistry in the powerwall and the usage scenarios that allow full warranty coverage. I picked a Sonnen battery because it is the battery for the zombie apocalypse, can't say the same for the powerwall. The Pika came in second for me for reference.