Haven't ridden the wagon, but did ride a rover. What a hoot to ride!
Bikes with cadence sensors usually feel like cheap bikes but interestingly the rover did not. Power ramps up very smoothly and the top speed of 20 mph feels plenty fast enough. It's exhilarating. Standover is limited but other than that, it's really tough to nitpick this bike. Even the mechanical disc brakes worked surprisingly well.
Anyway, that doesn't give you much intel on the wagon, but I know for a fact that at least one of their bikes is fun to ride.