Well as I am at Chandler Aviation, I guess I'll give you a look from someone whom is actually there. First off, I have had nothing but great training there. I just got my CFI over a week ago and will be working there shortly. Chandler has a lot of planes for an FBO. The instructors all seem to be very good. My instructor's name is Matt and I can honestly say he was very good.
Though the school does alot of primary training, they specialize in upset recovery, tailwheel and aerobatic training. This includes doing alot of training for various Federal Law Enforcement organizations. They have also been tasked with doing alot of Spin Endorcement's for CFI students of numerous Flight Schools and Academies.
The owner and the chief pilot are long time pilots (we are talking 10's of thousands of hours) and they are very experienced competetion aerobatics guys. They are also both DPE's and are old school. This for me worked out very welll indeed as I like their philosphy. They teach you to aggressively fly the airplane. And you will. You will also learn to feel confident in all areas of flying and you will never have a timid instructor not instructing you to do a turning stall because they themselves don't feel comfortable doing it. You will learn to own it......
Do they have all the bells and whistle's of new aircraft? No, but they have well maintained warriors and arrows that get the job done. I have no doubt that you will have a quality training experience here.
As far as Mx issues go, I have not experienced anything different than anywhere else in terms of aircraft that are used alot. But I never felt them to be unsafe. If I did, I would never have trained there.
Honestly, if you are in the Phx area, call an schedule an appointment to talk to someone and come see for yourself.