I had JNJ Plumbing install some rough plumbing for a new half bathroom that required them to drill through a concrete slab base. They did an absolutely fantastic job, were incredibly professional, and priced me at less than half of what two other contracting companies quoted me at for the exact same job.
They were very responsive for any questions I had and extremely flexible to schedule the workday. On the scheduled workday, they were punctual, immediately went to work (seemingly without taking any breaks), and completed the entire job within less than a day. They even cleaned up after themselves and mopped my floors for good measure.
I would highly recommend them to anyone in need of plumbing work that needs done and absolutely plan on using them again in the future.