I got this a couple of weeks ago and thought I'd add my thoughts.
Firstly the DVD is really excellent and definitely worth it. You get so much more than just a way to take off a ring and throw it on again. In fact the basic move isn't even explained until about the fifth chapter, after he's gone through all the background and what you need to know first. That's detail for you. The amount of sleights you'll learn and inspiration you'll get is worth so much, I came up with some variations of my own that got me all excited (don't wanna boast too much but I knocked out my sister by turning the ring to a coin then muscle passing the coin into my hand and doing the ring thing move at the same time. It looks like the coin flies up hits your finger and turns into a ring, try it).
Secondly it was more angley than I was anticipating but discovered that in performance there was more leeway than I thought there'd be. So far I haven't done much more than the basic move and finger jump as throaway openers to ring on band or whatever but they do get gasps. Someone last night said "I'm not even going to try and work that out" so it must be effective.
Thirdly don't worry too much about the type of ring, I generally borrow girls' rings and they don't fit on my finger but you can do what you need to do more or less from the finger tips. In fact I've been practicing with the ring wotsit off my keyring.
Fourthly, you'll get a good chuckle from hearing him say 'finger ring' if you've got a juvenile sense of toilet humour like me. It sounds like he says 'fingering'!!! Tee hee!!
The artist who does not rise, descends.