No, not yet - but I'm anxious to seem them - "Apocalypse Now" is said by many to include the most "Coppola Ego" and this certainly intrigues me. What is your opinion on the "Redux" version? Among my friends, there are many who prefer it to the theatrical cut but also some who dislike it strongly... 
I believe you got a point in praising "One From the Heart" as underrated - Coppolas reputation probably already was a bit "single handed" at the time he made it and I put it on top of my to-see list of his films.