I've looked into it and the only option I wanted was to own the system. Does not make financial sense in my calculations.
Lots of people I know have solar systems though, but all of them lease it. The math is much easier - if the amount you spend on average per month in electricity is more than the monthly lease price, it's a good deal. In some cases it can make sense even if the lease costs more than your current bill, depending on how much you think electricity prices will inflate in future.
Another important thing to find out about is what your home insurance company thinks about it. It's not a positive in their view.