Considered buying this BUT haven't because the Trailer wont play and I've tried TWO different browsers and my cell and it wont play on anything I've tried. I wrote Penguin and got a reply that "they would look into it" but as of yet, they haven't. I like simple, short routines that play out quickly and are very visual. I'm a senior and not good with any slights (even the simple ones) so my preference is typically "gaff cards" but also not a fan of "R&S". I WISH THEY WOULD FIX THIS VIDEO.