I brought this back up because I finally tried climbing with doubles and three climbers, although I used an ATC rather than a Reverso. There's a lot to like about it; one follower cleans all the gear his rope is clipped into, while the other follower cleans his own gear. We were probably quite a bit slower than a party of two because of inexperience with the sytem. We weren't comfortable having both followers climb simultaneously on every pitch, but we did do that on all but two or three hardest ones. If two of the three climbers are willing to simul rap, three can get down as fast or faster than a party of two, because more hands to pull and coil rope.