We have been using MKT PCB since 2011, and we have been happy with the quality and service received. We have ordered dozens of different PCB's, prototypes and full production quantities, and all the revisions in between.
If there is a problem, MKT is there to help sort it out. They are great at communicating and are there to help you if/when anything goes wrong or unexpected. We have also used MKT PCB for their PCBA services, and we were happy with the results.