The southwest is extremely hard on wipers. 7 months of no rain, low humidity, and tons of UV exposure. I use self applied rain-X in the yellow bottle (2 step process) with Bosch wipers with great success. Rain X application lasts about 3-4 months. But you've got to use the yellow bottle, not the pre-mixed stuff and not the one you put in your wiper reservoir. Those don't work. This is the way to do it:

Step1: Apply Rain-x liberally with small rag
Step2: Wipe windshield down with semi-wet/damp cloth.
Step3: Dry thoroughly with towel

Using circular motions like waxing a car for best results.