I was eyeing the Trektop NX Twill, but @ $1100, it made me hesitate.
I'll probably go for the MasterTop Skymaster in twill for $800, and get the $100 Quadratec gift card to buy something else that I don't really need.
The only real difference between the two that I can see is the MasterTop comes with a 3 year warranty, and the Trektop is a lifetime warranty. (both are 'limited' warranties, which probably excludes most any type of common failure.)