I flew an early prototype at least 5 years ago with Roger Hoh, the developer. The article appeared in Helicopter World, I believe. Anyone who wants to pm me can have the draft of the report.
I was impressed - it was designed to work best in forward flight, but actually made hovering slightly easier as well. Well thought out - but then again you'd expect that from Roger, who wrote most of the new military handling qualities specification for helicopters.
Without droning on, during a long transit from one airport to another (including liftoff and touchdown and transition to and from cruise), I needed to press the trim release a total of 5 times. The device moves the stick, and in the light turbulence encountered, it moved the stick about half a second before I would have made the same correction.
Nice to see they have it approved! Just wish it hadn't taken so long.