That's quite an innovative idea, but doesn't this retainer irritate the tongue more that the 'regular' one? plus, the standard bonded retainer doesn't "stretch" - with this one I'd be afraid I'd have gaps sooner or later.
I have a permanent retainer on the bottom, and removable on top. And I like bottom one more. It's more convenient and I don't feel the urge to take it off
plus it's invisible, which is sooo very important after the months of braces! Besides, I try to floss on the bottom too, it's not so easy but I try to "floss more vertically". Obviously it's not as effective as flossing on top, but at least that's something