Fried shallots do not add much to the burger. Don’t taste that much different to their normal burger. Patty and sauce pretty average. Potato bun is soft (duh) but you also get burgers with good buns at many other places.

Supermarket crinkle fries still taste like supermarket crinkle fries - even with shallots.

Only worth trying if are a shake shack fan in the first place. If not, don’t bother.