Is there a benefit of only two valves? Most of the effort in checking them isn't the part where you actually measure or adjust anything.
Just based on a quick glance, it seems likely that the X-Town is an evolution of the Downtown platform?
Besides shaving off all that extraneous HP and torque, the X-Town is 30 pounds heavier.
The price is excellent though, and presumably the main improvement they were aiming for.