I’m interested as well. It seems like a cross between the First Watt products and the .8 series. Nelson was able to reduce the transistors from three down to two. Based on his website comments his comments, he seems pretty darn happy with it.
He should be. Long term stability and quality in the way he wants it to be, in a product that is to be handled by anyone, with two simply implemented transistors.... is not as easy as it may seem to the uninitiated.