There is no denying it, Meenakshi Mukerji's (and the other artists that contributed their creations) modular designs are exquisite. The designs range from elegant and easy to comprehend to hair-pulling difficult, but luckily the instructions are very clear so if you do try to conquer one of the more complex designs you will be well instructed. It is one of the most frustrating things about following origami instructions that are not clear, you just sit there staring at your paper, eyes shifting back and forth between the paper mess and the instructions, and you are just 'how does that EVEN WORK?!?' With this book, you certainly have a very clear idea of how things work, even if you groan in frustration because it is a seriously complex fold.
I say, give this book a try if you are familiar with modular designs, if not and you want to get into modular origami, I suggest googling the instructions for Sonobe units, there are a ton of variations that really get you in the mindset for modular origami.