I recently purchased the HRT. Was using a D3 T-factor with Wiley rear. Double boot user since 8th grade, and I am 44 now. Was looking to try something with a the ability to move/lift heel a bit, especially with my limited back-ankle flexibility (2 breaks, unrelated to skiing) and hopefully allowing me to be more balanced over the ski, as I can be notorious for settling in on the back of my ski as I move through the course. Still have the front D3. A few points...
1. Was a much easier of a transition than expected, as it took only a few sets to get used to.
2. I ended up having to remove the HRT from the actual plate and move it up a set of holes to get closer to the back binding, so the binding pad actually presses against the front boot now, but there is still a gap between the front boot and my toes. I am a size 9.5 shoe.
3. I cannot comment on the kicking in, as I still get up with both feet in.
4. I like the configuration, as I feel I am able to get a better stance (taller) at the start of the pass, and also I seem to transition to a better stance with better weight distribution during the pass (but I have to remember to do this).
5. I am keeping this set up, or said another way, I really like it.
6. One thing to note, I have not crashed yet using this set up, so I cannot comment on the release.