We had a Porta-Bote back when we had a Corsair Trimaran (sailboat). It was a challenge to set up on the nets, but the biggest issue with it was the gawd-awful black marks the bottom center joint on the PB leaves if it rubs against your pretty while gelcoat. It was a decent dinghy - as Harvey mentions: nearly indestructible. Between a solid dinghy and an inflatable, I considered it to "slither" over waves; a bit unnerving at first, but it was never a safety issue while we had the PB. I would think it would be impossible to set up in the small cockpit of any C-Dory... you get what amounts to a wooden "pry bar" to hold the boat open while inserting the seats. And, speaking of seats, the Porta-bote folds up to the size of a surfboard, but you also have the seats and transom, which take up a considerable amount of room.
We already had an inflatable dinghy when we bought our C-Dory, but I sold the Porta-bote at that point, knowing that I wouldn't be using it with the CD-25. The Porta-bote was relatively convenient to take with the motorhome we had at the time (PB strapped on top of our Tahoe tow vehicle, seats and transom in the back of the SUV). You need space the length of the PB, plus more than it's width to set up (you stand beside it to get the process started).