Wow! Just happened that I had all ingredients on hand. Outstanding dressing!! I did the recipe exactly as written. The blue cheese I used was an amazing bargain from Costco. Next time I'll add toasted walnuts, pecans or almonds. The downside, I don't have any more farm fresh arugula -- if I did, I'd make more salad right now!
I modified this a little based on personal preference. And it was still wonderful! and easy! I used white wine vinegar since I didn't have red wine vinegar and it was great. Also, I added goat cheese instead of blue and walnuts.