Vivint? Like the home security folks? I didn't know they did solar...
Anyway, so I had them for home security/safety for... idk 10 years or something, forever in my mind really, had no complaints. There was a little confusion getting the service turned off, took a few months, but it's kinda sorta my fault for not checking up on their having charged me again straight away.
I turned the service off because we didn't really use it, but mostly because when the power goes off so does the system, making it basically useless for most emergency uses around here, which is primarily why I had it at all. Cell phones worked, Vivint security system did not; though they did call me up on the panel thing three hours after the quake, when power was restored, to ask if we were alright - they do get some points for that at least heh -- Also, the system auto emails if the power goes off - if this were a second home or our old cabin I'd probs have kept the thing just for that feature alone.