Sorry I missed your question about MDS express and DVD versions earlier in the week Holly has a really good video that explains the differences here on this site under Training. Here's the link -…"
As a demo I would suggest the DVD version if that's doable for your budget. It gives you the disks and all the materials in one fell shot making reinstalls easy and quick if needed. I'm a big fan of having the disks in my hand. Nice case too that accomodates additional disk collections you may buy later. The Express is perhaps the way to go if money is tight and you need to do it piece by piece. You can buy the express to get started with the full program and limited content (limited in images not in how the program works) then buy the Booster Bundle later on to get all the rest of the content the DVD version contains. Both versions will give you the full program files that allows you to work with downloads, etc. The only real difference is the amount of image content included. Another option would be if you have a workshop or order that gets you to the $400 level you can select MDS for 50%. If you have specific questions feel free to email me at email@example.com Hope you had a fabulous Christmas and New Years. I'm still not ready for it to be 2012 but the year refused to wait for me! LOL.