I was fortunate enough to eat at Jiro's once (went with some business colleagues who can get reservations). The tasting meal was outstanding, but it is a different experience than in the US or other parts of the world. My colleagues gave me the rules of etiquette of which there were many. You are there to eat (phone use is strongly discouraged as is excessive talking with the party you are with). The tasting meal is 20 pieces, and each piece came 1 at a time. You are absolutely expected to keep pace (if I recall, it was about 20 piece served in about 30 minutes). I was warned not to let multiple pieces back up in front of me. I won't claim to be a sushi connoisseur, and after about 10 or 12 pieces I start to slow down, so the pressure to keep up was definitely there. The other two big things they said was don't separate the fish from the rice, the chef finds this insulting. And they go through great lengths to season the rice and fish just perfectly, so I was strongly discouraged from slathering on soy sauce and wasabi (usually my go to trick for when there is a piece of fish I'm not all that fond of).
So, I'm not sure how hard and fast these rules/guidelines are, but where I was there with colleagues who are somewhat regulars and seemed to be known by the staff, I was overly conscious to conform to their guidance. So, the food is outstanding, just recognize the experience is different. Note; we were there for lunch, not sure if dinner would be any different.