We have a 8.61 KWh system. We did not purchase, we did a lease based on any repair issues being on our company, not us. Also, we are guarenteed a level of output, and if the level falls due to panel degradation [common problem] then we are paid the difference. Our panels are made by Kyocera.
Overall, we are very happy. Its a kick to watch our meter run backwards [1300Kwh in the last 31/2 weeks]. My only complaint was how long it took to get the system installed once we signed all the paperwork. Now I can't help but wonder why we didn't do this ages ago.....