Had a chance to take a VTX Black out on a 40k test ride today, from John's - I did the Lancaster 23 mile route... ProOne tubeless tires, disk brakes, 153 cranks, and Rotor chainrings 52/40/26, seat reclined to max. Oh, my....
 
Sweet ride - I almost didn't miss my full suspension from the SprintX.  I think the seat support being halfway down the seat helps reduce shock transfer from the rear wheel, and I know the ProOnes helped, too.
 
Handling was superb, as expected, with great high speed turn stability.  Downhills at 30+ were rock solid.  Hill climbing on the "5 mile hill" 8% grade was about 1mph faster than on my SprintX, staying above 9mph - the lower trike weight and Rotor rings undoubtedly helped - and I didn't have to use the 26T granny.  
 
Typical flat rolling speeds were 20-22mph, top flat speed was 28mph, and it felt good overall, but I don't have a direct speed comparison to the SprintX on this route... however, the VTX is probably a bit faster, if for no other reason than better aerodynamic profile than my Sprint.
 
The new wider neckrest is a definite improvement - wider, and cushier...  However, about the only thing I didn't really like was the fixed handlebar position - you can't tilt it forward/back or change the width -- this left my upper arms almost vertical, increasing wind resistance.
 
Overall, I would have to say that this is a great machine...  if I had the chance to try it in 2016 before buying the SprintXfs, I probably would have chosen the VTX...  Getchaone!
 
>> note on the Rotor elliptical chainrings: This was my first ride using them, and I immediately noticed that it was easier getting through the pedaling "dead zone"... I didn't notice any particular erratic change in pedaling rpm, it was just "easier"...  and I LIKE it...  and there were no shifting irregularities.  Kinda makes sense, since it creates a lower/easier gear through that pedaling dead zone.  I may just have to spend some bucks...

Quote from jayg on Apr 15^th, 2019, 9:31am:

 
Going through their configurator, choosing BB7 disc brakes and 10-speed gearing, 52/39/30 triple with short cranks, total comes out to ~$4500 delivered
 
Paul