First of all let me start by saying i hate any business name that replaces the letter c for k, or the letter s for z, so with that grammar rant over, I begin! Knock cabs are your average taxi service. They were a firm that were local to my school when I was younger and had to use them a lot to get to the orthodontist and have used them a once or twice in the last year when I was with friends in the Gillnahirk area. I found the service to be variable. Booking on the phone was never an issue, but getting the taxi sometimes was. Waiting times varied from a few minutes to about 20 minutes, which really cheesed me off when I was a 16 year old who wanted to get back to school in time for P. E or lunch! However the cars were always of a high standards and rivers were always quick and friendly, once you got a hold of them that is!