I bought a Porta-Boat when they first came out from Sandy K Enterprises CA, it must have been over 20 years ago. The boat is always strapped to my float ready for any lake. I have never had any leaks or other problems, the seams (staplers) are still in good shape.
Mine is a 12ft with no stern, she's pionted in both ends, the new ones have a square stern , much faster and better when using an outboard engine
The new boats have an excessive amount of floatation foam wich makes the boat very bulky. Remove the foam, especially from the seats and you'll have the perfect watercraft for the bush.