The barbers are fine, and generally offer a good service.
The Director (Paul Harris), it seems, frequently invites people into his chair, doesn't inform them of his price and takes them to the till, forcing them to pay an extortionate amount of money for a haircut that can be acquired anywhere else for a much more reasonable price.
He does all of this under the guise that Windsor Barbers are the "best in the UK"... I'm not sure anybody is gullible enough to believe that. It's about as credible as your local Turkish fast-food shop owner displaying a "best kebabs in all of the UK" poster.
There's an incredibly aggressive sales pitch at all parts of the haircut. The barbers aren't frightened to (surely) fabricate things to push you towards buying:
"Oh, your scalp looks inflamed, buying x will help"
"Oh no, your hair is a little dry, y will surely rid you of that dreadful and life-debilitating illness"
And to top it all off, if you attempt to dispute anything, you are handled with aggression and anger.
There are much more reputable barbers around Cardiff that offer the same standard of cuts, with a more relaxed atmosphere and free drinks, if that's your catch.
After all, cutting hair isn't exactly open heart surgery (as the Director seems to think), really, the customer is paying for the environment.
You can find out everything you need to know about how customer service is handled (and, by extension, how you'll be treated) by reading the replies to the reviews here. According to the Director, Windsor Barbers has the highest in-take of customers suffering from amnesia in the UK.