In my opinion, some people love the fastback look but honestly, it grows old not being able to drop the top. You have to pull the whole top off and leave in in the back or at home. The Trektop NX Glide allows you to fold back the top. It's similar to a Sunrider, but instead of just uncovering the front portion of the interior, the Trektop NX Glide allows the soft top portion to be folded all the way to the back of the Jeep. Opening the entire front and rear seats to the open air and sun.
That said, if you don't plan on dropping the top daily then the NX is a great top, otherwise, you want the NX Glide.