I had the Big Bang Burger which comes with 2 patties, cheddar cheese, fried egg, mushrooms and caramelized onions. It says it came with some Burgernator sauces but I didn't really taste that.
I really liked the authenticity and the freshness of the patty, it seems like it was made fresh right there on the spot. I didn't like how greasy and oily it was, there was literally a puddle of oil and the buns at the end were drenched with oil. The patty also fell apart multiple times and it was just a mess. Besides that it was not bad and I found the burger alright.
Also had some onion rings and they were average, but the sauce for it was pretty good. I think it was some mayo mix.
Maybe, I just had a bad experience ... but I'd like to come back and try a different burger and it may be a better experience next time.