We're very happy with the MWB DVDs. One of my girls watches the DVD then does the problems on her own. She occasionally needs some guidance from me, but usually gets the material fine just by watching. My other dd watches, then I have to go over it with her again, and do a few problems with her. She does tend to be a little spacey and I think her mind wanders while she watches the DVD. I think the teaching on the DVD is very clear.
The book has answers (not worked out) to the odd problems, except for the chapter review/test. We often do the even numbered problems if the girls need more practice, and we do most of the story problems. I bought the solutions manual from Amazon Marketplace for $60.00. It's kind of hard to find, but well worth the price.