Previously, I spent a lot of time in kayaks. And have spent a fair amount of effort looking into folding kayaks.
The usefulness of a folding kayak is related to what it will be used for. Paddling protected
anchorages in winds under 10 and waves under a foot? Anything will
work. The quality/robustness of the construction needs to be proportional to the conditions. Knowing that I will be using the
boat outside protected waters, I looked for something robust.
I looked at the three piece
boats as they checked a lot of points on my list. It looked like the joints in the plastic
boats would wear quickly and get sloppy over time. The Oru looks good, but without some type of internal frame, the hard body could fail. CLC makes a
wood nesting kayak that is interesting.
Pakboats are hard to find so I have not had a chance to look at them.
FWIW, I am leaning towards reaching deep into my pockets for a Feathercraft or Klepper. YMMV-