You guys should check out 3M Crystalline instead of Huper. The specs about the same as both have 99% UV rejection however my local detailer says 3M is better. I also saw a demo and it's awesome stuff.
I would do it on my car, maybe 70% front and 50% all around however it cost double the amount of regular tint.
I guess you can't go wrong either either choice, just tossing it out there that there's another product besides Huper.