You may not have been following Robinson news, but the symmetrical H stab significantly improves low-G recovery because it eliminates the right-rolling tendency. They thought, and always taught, that the tail rotor thrust causes the helicopter to roll right in low G, but it turns out that was wrong and it was actually the horizontal stabilizer, which had been only on the right side, that caused the helicopter to roll right in that scenario. The symmetrical one largely fixes that, so I already have had it retrofitted onto my own R44 - it's just safer. And David said the SAS in the R88 can't be disengaged (without pulling the CB) and resists improper pilot inputs. But you're welcome to watch the video.