I have been into this location a few times since I moved to Phoenix. The guys there are very knowledgeable and helpful. However, they are generally expensive and they almost always have to order what you need from California.
For example, I just called them to inquire about purchasing a couple of high-end Franke drinking-water filters that we have hooked up to our sinks.
They wanted me to order a dozen, as they don't sell them individually and they wanted to charge me $76.00 bucks each plus tax PLUS shipping!
Now the good folks a few blocks over at Clyde Hardware have them in stock, available by single unit for only $57.00 each plus tax.
What I have learned is that sometimes going to the little guys actually pays off. So shop around!
Having said that they are about a specialty plumbing as you can get so if it's something to do with plumbing, they'll have it, or if not they can get it for you.