I'm on the fence somewhat on this one...although close to falling off on the "I don't like it" side.
A spare on the roof rack, while nice in the size of tire is no longer is an issue, is a royal PITA to get down/put the other up if needing to change.
This would be super convenient over a roof or undercarriage mount, I can't see it working with the lift gate (power or not)
I'd much rather be able to fit a 32" tire in the stock location (I would love a lift and 32's!!!)