I recently got the NX and its a night and day difference rom the trektop. I really like it so far. I had the gen one trektop with the metal door surrounds that bolt in place, the header that requires a bar and brackets to screw in place, and the top that velcros in place.
The Trektop NX is totally different and they made smart upgrades. It has a much better header setup (similar to factory), better door surrounds (similar to factory), a better tailgate bar setup, braces similar to the pvc brace I had made, and no velcro! And I don't need to carry wrenches to unbolt the surrounds. I recommend it so far.
1972 Commando on Tons & 40s