There inline poppits not spools.What? All three of those are spools. Check out here: http://www.zdspb.com...animations.html
Etha and Drones are not spool valves. And I don't believe the XVR is either.
I think you would be very pleased with a Drone DX, then. The other comparable priced spools (XVR and Etha) are not as smooth as the Drone DX, while maintenance and price are similar. The used market has a few choices as well (DMs, v1 victory with spool engine, shocker, quest, droid, etc.) if you decide to skip new for new-to-you.