I've always loved the term "insanely great." It originated, as far as I can tell, with Steve Jobs, back around the time of the original Macintosh (1984).
I bought one of those first Macs in February '84 and I've been a Mac person ever since. The Mac embodies one of my main design goals for software - to make it so pure and intuitive that it teaches itself.
For a great technology and business book that covers that unique, "insanely great" user-focused ethos, I recommend "Revolution in the Valley" by Andy Hertzfeld - great book on the creation of a product that, based on the technologies available, shouldn't have even been possible.