Good overall experience but I HATE BEING LIED TO! Beware the FALSE ADVERTISING! Upgrade to a mega shake with a refill and don't expect a refill. After asking for the refill two employees explained that they don't have bottomless milkshakes. We didn't ask for a bottomless (unlimited refills) milkshake, we asked for the refill as advertised in the menu. One of the employees then explained the small extra portion in the metal mixing cup served with the glass was supposed to be the refill. Would that have refilled the glass cup? No way! Milkshake tradition dictates that the milkshake be served with the leftovers in the mixing cup. This has NEVER been considered a refill. Especially because it couldn't possibly refill the glass.
Bottom line is that we loved the staff but I HATE BEING LIED TO!!!
Dear Red Robin Marketing Department, go back to the second grade for a refresher!