The gentleman I bought my T9 off purchased it in 1962, I believe, and kept it in remarkably good shape. I am still paddling it in the original skin, though I've added hypalon keel strips along the lines it was previously folded along, where the original rubber had decayed, and I've restitched a few places where the original stitching was beginning to go. It is watertight again now, and I'm waiting to see how much longer the original rubber holds out. I assemble mine every time I paddle it, and take great pleasure in the engineering as I put it together. The few times I've paddled it in company it felt plenty fast enough and no one was waiting for me.
Last summer I purchased a second hand Wayland Harpoon, which was purportedly about six years old then. It is not a bad boat, and I enjoy paddling it; but it is not as well built as the Klepper. The hypalon and dacron hull looks perfect; it is the fittings on the frame and hull which let it down. Despite its young age, these are already bent and corroded, which might be the result of abuse by the previous owner, but I suspect is simply inferior quality metal (and probably salt water use too). (My other complaint is the big bag it came in is a complete pain to lug compared to the Klepper's two bags, and it seems heavier--but my intention wasn't to knock Wayland but praise my antique Klepper

.)
I also like the flexibility to walk my boat to or back from the river when my wife has the car, and I occasionally take it by train. It is probably too heavy to take by plane without paying a considerable premium.
So yes, I like my folder(s) for their characteristics. (And I recently picked up a folding canoe to go with them.)
Ian