Daniel Wallace's Greek Grammar Beyond the Basics is missing all of the very helpful topic, Greek word, and Scripture indexes that are found in the print edition. These are very important for using this book for learning the language and research. If you want to see the places where Wallace discusses a particular verse, you cannot search for it in Logos. Even though it has Bible references that are hyperlinked, you cannot search for a passage with <Bible = 1 John 2:28> and reliably find all of the references.
For a few years, I have been encouraging my Greek students to buy the Logos edition rather than the print edition, but I may have to reconsider this decision. I hope this index will be added to this important and widely used textbook.
I would also like to see the Bible search feature work properly in this type of book. So if I search for <Bible = 1 John 2:28> it would find passages marked with a list of references (e.g. 1 John 1:9; 2:28) as well as a range of references (1 John 2:20-39) and even a single version, which is clear in context (2:28).