Ive used Olive Tree ever since I had a Palm 3+, and it is the most useful app I have. The reading plans allow me to keep up with my Bible reading. Having resources hyperlinked overcomes my lazy tendency to not look for a cross reference with some passages. I have it on all my devices and even use the notes for taking notes in church on my iPad. Everything is synchronized with the cloud. I have less than a handful of complaints, but the good way outweighs those. Sometimes it can be a little buggy and not keep up with where Im at in my readings. Id also like for the app on my MacBook to have the same features as my iOS apps such as keeping note markers in the text as well as the index. Great app; great selection of Reformed resources in the store. I love it and would hate to be without it if I ever have to.