I just bought it recently. The dvd is about 15 minutes long. Gives you a street performance and of course the method.
On a scale 1-10, 10 being the hardest I would give it 3 or 4. It's quite easy.
At first I didn't think of getting this trick, I don't really like join magic especially if it involved a gimmick, especially since Digital Dissolve is a bit expensive. But I'm glad I bought it! It's AMAZING! It's soooo simple, the method is sooo simple and genius and it plays amazing to your audience.
The gimmick should last you a lifetime as long as you aren't reckless with it. And if it does break or if you lose it, just contact theory11 and they should send you a new one.
Hope I helped. =)