For my part I am very impressed with the iOS app and think you guys have done a really nice job! I'm continually impressed with features I discover. Plus, the app is very elegant and makes for nice reading. The speed is just fine as well.
I'm coming from being a big Olive Tree user and will admit that in some ways I do favor certain features of their mobile app, though ultimately I favor Logos.
Specifically, one thing I really liked how easy it was in Olive Tree to search on a particular English, Greek, or Hebrew word and get to my dictionaries. They have these Strong's tagged Bible versions that allow for the Strong's numbers to be hidden, thus enabling one to be looking at the clean Biblical text, click on a word, and have the Strong's definition pull up. From there it's one click to search all dictionaries based on either the English or Greek/Hebrew word. Pretty cool!
Another specific feature I'd love to request is the ability to set highlights for a particular note, as in the Logos Desktop version, and then be able to highlight away on the mobile app without always specifying the note destination.
Finally, is it possible to download some sort of Logos engine that would enable the full app to function offline with whatever resources one has downloaded. That way, those of us with more capacity, could utilize our apps even more.
Thanks for such great products and responsiveness!!