GREG WALSH

They're family owned, they are excellent and I have been using them for 25 years.

If you have an emergency he or his son will show up very quickly. Otherwise he can be a little tough to schedule because they are so good. I give them a B on price because I wouldn't say that they are inexpensive, but maybe A would be more fair considering that you don't have to deal with the inevitable leaks and fixes down the road.
If you work with other plumbers you will learn to appreciate Greg.
He was initially recommended to me by a friend who is an MIT graduate and can do virtually any kind of home repair himself. He said that Greg was "a genius."

Went fantastic. They were very responsive, took time to explain what they were doing, asked us what we wanted, always polite and professional

Greg is an old school professional.  He knows what he's talking about, says what he means and follows through to the end.  Best of all, the quality of his work is amazing.

David Walsh was referred to me by a friend.  Called him on 5/24/13 and he came on 5/25/13.  David is personable, explained my situation, and cleaned up very neatly after he finished the job.  Very happy with his service and will use him again should I need to - will refer him to any friends who are looking for a good plumber.  Felt his price was very fair.  Just called him on the phone re a problem I was having with my dishwasher and he helped me solve it without having to visit.  How 'bout that!