I have a 14' portabote. They do work very well. I have a 10 hp motor on it and it'll run about 15 mph with 2 people according to my gps.
To be honest, an inflatable boat is probably easier to set up and can handle a larger motor. Portabotes newer than mine are easier to set up but they aren't perfect. If you're towing a car put a roof rack on it and cartop the Porta set up. They're very easy to load when set up. My 14 only weighs 105lb and I can can load it easily by myself at 71.

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