I was one of their first customers when they set up their UK and Irish operation. Both quality and service are excellent. On the two occasions when they have made a mistake they have sent corrected boards very quickly, and didn’t even charge us on the second occasion which involved 100 production boards costing quite a lot of money.
It’s best to send a PCB file, they charge extra for processing Gerbers. They can deal with most formats, including that for the Pulsonix software I use and Eagle. It’s easy to forget something when sending Gerbers, I like their system.