1. A sheet of the Errata of the 6 guides should come with every purchase of a MGMAT book or set.
2. The Foundations of Math should change the formatting or structure of the Drills within the drill sets. I often waste 30-40 seconds looking for the problem I'm on, or the answer to a problem I have just solved. Due to the large number of practice problems and how they're all chunked together makes it difficult to quickly locate where you're at.
These are just small criticisms. Overall, I am very pleased and impressed with MGMAT as a company(their efficiency, their thoroughness, their dedication). It's a blessing to have such a great Test prep company! A breath of fresh air :)