Do you want my opinion or the OH’s? She would just leave you with a load of expletives!
We went to the one in MK. The chips were quite nice and you get a lot, but the burger was just ok, bun nothing special. The place was filthy (as in tables and floor, not necessarily the kitchen being unhygenic). It costs a lot for what you get.
The OH is a bit picky when it comes to meat (flirts with going veggie). She went for the veggie option and it was just a plasticy cheese slice, onion, gherkin and a bit of salad. It was packed so tightly in a foil wrapper it was just a squidgy mess that looked like it had been kicked around the floor for a while.
It just seems horrendously expensive for what is in effect a fast food place.