Surprisingly large portion and shockingly many orders (not dining-in orders but delivery orders). Most likely you might not be able to secure a seat right away, and would be required to wait long. As a note, the place is closed after 2pm during lunch hours.
After a long wait, we got our burgers. To be really honest, burgers were not in any way special; had too much pepper seasonsong on them; and generic to the mouth. My suspicion would be that burgers are quite scarce here – which is the main reason why demand is so high.