There has been some previous discussion not long ago about DVD format vs MOV.
I have and love the "Strictly Rhythm" DVD.
The DVD format is a big advance over what I get on the "Variations" every week or so.
My DVD player offers great control over how I see the steps. Control includes Full Screen, Repeat from Selected Points A and B, Variety of Speeds, and more.
On my PC I view the DVD with Nero software's "Showtime". It also offers extra control features not available on my DVD player.
I haven't tried it yet but Nero also enables mobile viewing and I hope to find time to investigate this.
I hate that this might sound like an advert but I am happy to endorse the product. For more info go to Google.com and look for NERO MOV