I have two Bear Vaults, and one Garcia. I use them all the time just so I can sleep peacefully at night. The weight is no big deal, the biggest problem is fitting them into a small pack. The large pack holds them with no problem.
They work well as seats, and keep the food out of the natural residents bellies. In some areas the chipmonks will drive you nuts, so its not only for the protection of the bears natural menu, its all animals.