I don't like the rental/lease paradigm because you are constantly milked every month. For some, it might make sense, especially those that can't afford a high buy-in cost of some software. If you are making the ducks every month, it is a write off. What happens when times are slow? Do you want that nut on top of everything else? Something for you to consider on top of everything else.
I guess I am old school, but I am boycotting all software that doesn't offer a permanent/perpetual license. I vote with my dollar.