Thks for reading abt the trip. The KHS Cuppa that I used was a highly modified one with XTR RD, upgraded brakes, double chain ring etc so I can only comment that the one I used performed flawlessly. It carried 3 panniers and was still able to climb most hills.
But it felt very heavy, and the folding mechanism was rather simple. Folded, it needed a bungee cord to bring everything together but I think for its entry level price, it did the job brilliantly. It also uses 18" wheels so not easy to find spare tire/tube (like Birdy).
I was largely very impressed with this mod version of the KHS. Hope that helps.