I decided to try one of the custom ("gourmet") burgers at this place during a return visit here.
I basically ordered my burger on the touch screen, deciding what I wanted and seeing the additional cost (if any) of the topping/garnish. For the burger, I could choose almost everything from the type of cheese, the type of bun (or lack of bun), to the garnish/condiment. The only thing that I believe that I couldn't choose was the type of patty and it was an angus patty. I chose what I wanted on my burger and then opted for a combo (so also got fries and a drink). The display/ordering terminal asked me what device number I had so I grabbed one of the devices next to the display/ordering terminal and entered the code. I then paid with my credit card and got my receipt.
I went to sit on one of the tables with a sign on them and a few minutes later, one of the McDonald's employees walked over to my table to look at the number of the device that I took as well as my receipt. She then left an a few minutes later, she brought my drink.
It took ~12 minutes for them to bring my order to my table so it was longer than a "usual" order. This location can get very busy since it is located inside Central Station so I can easily see it taking longer than the ~12 minutes that my order took to reach my table. Since it takes me roughly 20 minutes to get to this place via walking through the "underground city" from where I work and another 20 minutes to get back to work, it doesn't leave a lot of time so even though I liked the burger, I don't see myself re-ordering it because of the price as well as the time needed.