Stoked on all the JPW product's I've owned.
I feel like with Cats, it's good to with bigger diameter tubes, you don't have a floor to help with water displacement, and cat's get sluggish quick when really loaded down.
For a full on kegerator loaded with a pony keg, I would want at least a 14' cat with BIG tubes, or set of 16' tubes. I might be worth taking a look at the JPW Royal flush.
I've taken a keg with 2 passengers down the Royal Gorge in my NRS E-140, but it was a heavy boat. Forgiving water level to. I prefer a keg in the front of the boat, since it is a lot of weight to try and balance out with other gear or people.
In Utah it is illegal to bring them into the state