I would avoid Chandler Air Service. I used to instruct at IWA about 3.5 years ago and our school sponsored a safety meeting and invited all flight schools in the area. Most of them sent at least one representative. We discussed safety issues at the local airports and frequency congestion as well as what we could do to be safer pilots. Chandler Air Service was one of the only schools who refused to attend and they are one of the closest schools to our airport.
I had a couple students come from there and they talked about the lack of safety and standardization and how the disregard for checklists really bothered them.