Peter Luger's Steakhouse in NY. I've only been their once but their Porterhouse is amazing. (subjective)

I spent close to 2 hours eating. The best time to have the munchies. Hehehe.

Cons: (from my experience)

You can only pay by cash, the ambience sucks and the service is poor.

My friends and I went there for the steaks only. We really didn't care about anything else.