As we were remodeling our entire house, our architect spec'ed a certain brand of doors in his designs. We had 11 interior doors and 5 exterior doors including two sets of specialty french doors. A quick search led us to Pioneer Millwork nearby us so we could go and see a showroom. We were new to all of this and didn't know what we were really doing, but it was very comfortable there and we received personalized service to help us figure everything out over several visits. Unfortunately, we didn't realize that our contractor/builder would have his own set of partners where we would be getting our doors, windows, etc from. And so we didn't end up using Pioneer. But they were the ones who helped us narrow down exactly what we wanted.
I mark off one star only because their prices couldn't compete with those offered from our contractor's. That's partly because Pioneer would have had to custom make a few of the doors and partly because our contractor gets volume discount. Nonetheless, working with Pioneer was a positive experience.