Check the history of whoever you buy from.  There have been a lot of companys go since the rebates were reduced.  Check if the manufacturer or retailer take responsibility for any warranty issues.

Do you have a smart meter?  I had massive grief with the electricty companys after the install.  I had a retail power supplier who had to contact the distributor to get my meter changed and then configured.  I had to get actively involved as the retailer stuffed up the works order to the distributor three times.  If I hadn't got involved the distributor admitted they wouldn't have told me there was an issue.  The only bad press I have heard about solar is actually getting the power companies to hook the thing up as neither the retailer nor distributor benefit.