I have been coming to Lux for years ever since I started graduate school here in AZ.  What is there to say that hasn't already been said other than hands down it is my go-to coffee spot in Arizona.  Such a warm and diverse group of people, rotating artwork, the perfect study music playing in the background (although it is played a bit loud), espresso roasted on-site and baked goods made on-site.  Always find an excuse to end up there for a café au lait or a velvet if I have a sweet tooth!