The Trektop NX is a great top, especially for the price. Had I not scored a killer craigslist deal on a factory premium top, that is what I would have gone with again. I also quite like the fastback top look on the 4 door.
Just to point out though, as I know someone who very recently made this mistake... Bestop still also sells the regular non-nx trektop, which is a whole different story. The non-nx lacks the bows (so pools water and flaps around), and while it's quick and easy to go full topless, the windows don't come out separate, so it's kind of an all or nothing thing (cumbersome to just take down and throw in the back); not to mention a mild PITA to put back on. They came across a deal on one and jumped on it, not realizing there was a difference.