Now dangit... I wrote a three paragraph review of these tapes, and it didn't post on here. Errr... I dont want to write this all out again!!!
In short, I have viewed the King multi videos on a couple occasions and I really liked them. I'm not a big King video supporter, but they did a really good job with this.
This would be a great video to get before you actually start your multi training. They cover all the usual ground school topics: Single-Engine Ops, Vmc, Identifying and Verifying Failed Engine, Shut Down Procedures, Rules of Thumbs for flying single-engine, etc.
They did most all the filming in a Beech Duchess, which might help you a little more if thats what you plan on doing your training in.
Overall I would recommend it to someone.