I was thinking about renting them, just not sure I want to shell out more money if I cant make the decision by doing research :-)
If you rent from LensRentals and decide that you like it, you can click the "It's a Keeper" button and buy it outright. The buyout price takes into account your rental fee, the lack of return shipping needed, etc., and you know exactly which device you're buying.
We're a Canon/Profoto family: five cameras, sixteen lenses, fifteen Profoto lights, too many modifiers.