I like the idea and there is a good review from a credible player and I'm about to pull the trigger, BUT, one question remains and I've not seen an answer anywhere...

Does this attach to the bottom of the instrument or to the lap? Or just sit on one's lap? I would kind of like something that I didn't have to worry about falling off my lap.... I have a yoga block with a large neoprene knee brace that wraps around the block and the bottom of the instrument that works pretty well, but it slides to the side sometimes and has to be adjusted... That's a little aggravating. I was hoping this would be more substantial.

Does someone make anything like I want?