I bought it, drilled one ball, ring finger span felt WAY too long. I made an adjustment to shorten the ring, then it just never felt right. I practiced with it a few times, then decided to punt and sold it on eBay.
The method made sense to me in a static position. If I could keep that feel through the swing, I think that I would like it. I didn't seem to get it on my initial trial. With that being said, it's a little different way to think about pitches/angles, but at the end if the day, this can just as easily be described using the standard T layout...