I have the original Nti in 7 weight. I bought one when they first came out and back then, it was a cannon! And, by today's standards, it's still a cannon!
I recently tested a few new lines on the #7 Nti that were not available when the rod was first produced...... The rod is still a cannon! I sure like to try a Rio Outbound Short type 6 line on that #7 Nti!
If you want one of the longest casting (and an extremely light fly rod for its line weight), get one! They are a lot of fun to cast and it's flat out amazing how that rod launches line!