I currenlty own the Jack, I belive it is similar. I enjoy the jack because of the full size frame and wheels. I live in NYC and feel I can really beat it up. Somthing that my dahoon mariner would not be able to handle. The bike is a bit heavier than a model with 20" wheels. If I remember correcty it also has more speeds than the jack, and slightly more weight. I'm not sure where you live but it's convient to lock the bike b/c of the fold. (able to lock both wheels, + frame) with a 3' chain.

Contrary to popular belief, just because you have a folding bike does not mean you have to carry it around with you everywhere. I lock mine up when I take it to a bar or event. When I get home it gets folded and taking into my apt.

I'm going to agree with folder fanatic, what are you going to be using it for, where are you going with it, how many miles, etc.

(my spelling is terrible, disregard any mistakes)