I'll chime in with my experiences and thoughts as well. I initially purchased the set of eight
mgmat books and worked through most of them on my own. I was also planning on registering for their class but in the end decided to enroll with veritas Live online in order to gain new strategies, practice problems, and tests. I'm a little more than half way through the class so far.
I actually disagree with bb a bit. I feel that the
mgmat books are more thorough in their explanations and in laying out strategies and concepts, whereas the veritas guides feel more like workbooks to me: basic explanations followed by a ton of practice problems.
Overall I think I like the manhattan guides better, the math guides especially the numbers properties guide were very helpful to me, when I first started studying my math was pitiful. Also the
mgmat practice tests are much better than the veritas ones. Yes veritas gives more but only 5 are written by them, and none of them are as good as the manhattan ones.
What I do like better about the veritas books is the dedicated ds book and the combinatorics book. A caveat: the practice problems are divided into assorted problems which are easy to mid level and constitute 90% of the practice questions, and challenge problems which make up about the last 10%. in the ds book all of the assorted problems are very easy even for me and math is my weak point.
But the best thing about the veritas books is the number of additional practice problems. whereas manhattan only has drills after every chap, and their practice problems are just the og problems.
Last thing I'll mention, I don't recommend the veritas live online class. I don't know how the in person classes are but in my class we work directly from the books. We basically go through the opening sections of the books page by page, the teacher may as well be reading it to us. There is very little student involvement because there are over 40 people in the class. Also I was under the impression that there would be a moderator present to field text questions, but there isn't so the teacher has to stop and verbally answer every question, it's very frustrating. IMO it is more efficient to just buy the books and work through them on your own, it's faster and wastes much less time. I can't comment on the
mgmat classes but I'm quite unsatisfied with veritas' classes. I do recommend the books however for anyone looking for 100s of extra practice problems.