Burger King launched a wagyu beef burger recently in the UK, and despite it being double the price of their normal burger I was so looking forward to try it. What a big disappointment! It didn't taste of wagyu at all and was no different from their normal ones. Had it not been for the packaging and different bun, I would say they've conned me by giving me a normal burger... Maybe they did. What a waste of money.
I haven't seen wagyu mince beef in my local supermarket before but I heard the ones from Costco are quite good, I might try that some time.