The Diploma I think we are both refering to is the natural version. The maduro is similar but per past conversations with Smoka we are both hung up on the natural.
Now to answer your question, "is it worth three padrons" that is tough. I would not place this cigar as my everyday cigar (although I would like it to) because of the price but I save them for the special 2 or 3 occassion out of the week when I really fee like I have earned my cigar. Be it the weather is perfect, a good day at the office, etc.
On another note, I would say this cigar is significantly different from a padron. With few exceptions it is the most flavorful and fullest bodied cigar I have ever had the privilage of smoking.
All that said, I would smoke and continue to buy this cigar really at any price. It is the best cigar I have come accross in my 10+ years of smoking. But be warned it is not for the weak stomached. It is definately one for a the connosuer who was a developed palate who can really appreciate and differentiate the aromas.
In my mind this one of the best kept secrets in the stogie world.