I would peruse our Japan forum before committing. I've been to Jiro a few times over the years, and while Ginza has remained a steady boat, Roppongi has gone downhill in terms of its clientele. The food is still just as amazing, but the experience no longer really measures up as the location has become more of a side-car to shunt foreigners who want the "Jiro experience". The latest Ginza location review from a fellow FTer in the Japan forum suggested that Jiro-san's age is catching up with him, he is slower, needs help from an apprentice in keeping up with who gets what, and that could be a factor in reducing the volume of bookings he needs to serve and moving guests to the other section, and keeping him with his loyal regulars. It's certainly not how I want to remember him, so I haven't tried to go back.

Head over to the Japan forum, there is plenty of advice on some amazing sushi restaurants to consider, and advice with navigating Jiro bookings and experience if you still want to try.

In my experience, the top level restaurants that accept foreigners, and not all do, will prefer to work with the concierages from Mandarin Oriental, Aman, Four Seasons and hotels of that category, especially as it reflects on the "quality" of guest the restaurant would be receiving.