I have a prototype HH, NOT a production one. I emphasize this as a preface to having used it DdRT for the first time yesterday. I rarely climb DdRT, like 10 times in the last year. I had a bit of trouble with it on DdRT with a leather cambium saver over a 3" diameter top branch, which is under the 5" diameter recommended as a minimum for the cambium saver. I didn't dial in my valdotain wraps for my rope. It may have also been the interaction of the prototype dog bone (one of the earlier ones made) with the prototype HH.
It seems from what I hear, and figuring that Paul has it dialed in before production, that my difficulties were operator error (not dialing in the number of hitch wraps) and prototype fine-tuning (the dog bone is very hard to fit into my HH midline, by a few hundreds of an inch of too small of a hole in the HH, again this prototype was made before the dog bone, I got two oxan biners with my prototype).
All this being said, Kevin Bingham has to be applauded for leading us into hitch dependent SRT devices with the ZK-1 and ZK-2, though I think that they are eclipsed by the Hitch Hiker (which again, from what I'm hearing, all the bugs that I experienced with proto-HH and proto-dog one have been designed out). The ability to change seamlessly from SRT to DdRT is big, along with not having to engage the RW to keep the hitch from locking up, and a more compact (if only slightly) set-up. The stiff tether for the RW is a good improvement, but the tetherless design of the HH is better. Oh yeah, there is no need to make an adjustment to the hitch hiker when climbing on different diameter ropes as happens with me on 11.7, and Erik usually on 1/2".
People think that $160 might seem like a chunk of change, but for those that embrace SRT, it will be SOOOOO worth it. The increase in production and increase in climber longevity (IMO, people will be more likely to use leg propulsion with 1:1, and won't be fighting friction from DdRT) will make the purchase seem like a drop in a barrel. Savings on spliced hitch cord alone will pay for the HH over time.
Once I get my new commuter up and running, I"ll be buying a production Hitch Hiker, for sure!