It's as much a chain as Nobu. There are like...less than 20 non-Japan locations.
I was there two months ago and ate their shitty English food. I'll stick to Indian and other non-white people food this time.
admittedly I forgot this was the fast food thread and that place looks like a better version of a "Yo Sushi!" but still, there are plenty better restaurants in London to get "excited" for