Auto Valved Harps

Just came across these on a forum and watched a video of Richard Sleigh playing one. Very cool sound. As much as I could gather gives me these impressions: 40 reeds, octaves in Richter tuning (double holes for all of the 10 standard holes), all reeds valved, available in all keys.

Questions that come up in my mind (once I find it): still can play all bends? Blow and draw? Useful in blues? If not, what genre would these be useful in?

Just haven't heard about these before. Thanks for any response if someone has one or has played one.