Well, we have been going to the Phoenix Children's Hospital CF clinic since Ethan Sky was 10 months and he is now 4 years old. Please remember that i am just one person as i am sure others have very different opinions.
My overall thoughts on the CF clinic are that they have one plan for all CF patients and are very resistant to challenging their treatment plan. They know us now though, and know that we will do our own research and do what we feel is best and not just what they do for every CF patient that comes through.
The nutritionist is good mostly, she seems to always be in a hurry but i am sure that that is the same for all medical care specialists. We are challenging her quite a bit though in refusing to do Nutren Jr. and making our own "healthy juice." As usual they pressure a lot about weight issues.
The altitude in Phoenix is fine, no challenges in that area. It is very dry here other than during the "monsoon" season in July-September. I have yet to be very good about using a humidifier as I get so scared about making sure it is really clean and also I haven't found a really good one at a decent price.
The acutal Phoenix area is horrible with polution and there are notices during the pre-monsoon summer months about bad air quality and to keep persons with health issues inside. Outside the phoenix area, the pollution does not seem as bad.
I can't really take the kids out during the day in the summer time as you start sweating the minute you step outside. We add salt into everything and give water like crazy.
Hope that helps. Please let me know if you want any other info.