I'm registered with loads
a few have been one visit and never gone again 'cos i was so shocked by their "care"
one locally is used for the cats, and emergency care for the dogs, they are very good, but also very expensive (cost me over £200 for Jarvis to be sedated and have his injured paw stitched last summer
) and then i have the PDSA which the dogs are registered that i use for their routine/non-emergency stuff. (and always leave a generous donation too
)