Hi, thanks so much for the great review! I'm thrilled that you found the materials so helpful—we worked really hard to update everything as quickly* and also as thoroughly as we could after the test change.
*Publishing cycles are unbelievably long. Believe it or not, we turned in all of our text for the new books
last October. It takes almost a full year to format, edit, proofread, print, and ship books to Amazon / bookstores. (At least, it does for books that are this long / complicated!)
One piece of news: Our new GMAT Dynamic Question Set Builder (aka DQS Builder) tool just went live today. It can be purchased by itself, but full access also comes with the All the GMAT book set—so, if you get All the GMAT, you don't have to separately buy anything.
If you prefer to get individual books, we have three books total, each of which comes with access to a relevant *subset* of the DQS Builder problems:
(1) All the Quant + DI
(2) All the Verbal
(3) Advanced Quant (ebook only)
The All the GMAT set includes the first two books (AtQ+DI and AtV) along with a host of additional online resources—these resources are why All the GMAT is more expensive than buying the two books individually. For example, All the GMAT comes with full access to the DQS Builder, as well as full access to GMAT Navigator, which has our own solutions for every problem in the 5 most recent editions of the main Official Guide (note: OG itself is sold separately by the test-makers). All the GMAT also comes with our full 12-week study syllabus—it'll tell you exactly what assignments to do every week—along with other lessons on time management, analyzing your practice tests, etc. (There's a reason we called it All the GMAT!)
One more note: We did also publish a new edition of our free Foundations of Math ebook; it's available (nearly 500 pages, totally free!) on Amazon. We no longer separately publish our Foundations of Verbal book; now, our verbal foundations study material is all included as the first unit in the All the Verbal book.
So we're very happy and also we now need a vacation.

Happy studying, everyone!