Accordance is such a mature and finely developed program that a full review is impossible. I certainly don't have the patience to make an attempt. Rubén Gómez of the Bible Software Review has done a great job with a review. I highly recommend it.
There are, of course, even more features to highlight. At the top of the list in my opinion are:
- Well-thought-out keyboard shortcuts
- Tremendous stability
- Text display customizability
- Advanced Grammatical Tagging of core texts
- Ridiculous "older system" compatibility
- Amazing user and support system