They may cost a little bit more than your normal vet, but this is a small price to pay for the quality of the staff. From what i have gathered the vets at the cat clinic are specialists in felines/cats. They also have all the "machines and gadgets" that some vets dont.
It is good having a specialist cat clinic in the area but they are more expensive and you don't have a dedicated vet when your pet has ongoing medical problems. That (and their pricing!) is the only down side I've found.