both the Caddis are great tubes, I have the NavIV and loved it, but I ran into some extra cash and picked up a Super Fat Cat. IMHO this tube is by far the best tube I've every used. It moves real smooth through the water and is extremely comfortable with tons of storage space. If cost is a concern go with the Caddis, if you can spend more get a Fat Cat or the super fat cat.. good luck
Bruinfootballfan!!!