AHR is great and knows their business well though might be overpriced (see below).
Our compressor failed due to a another company's work on our unit 3 weeks prior. Of 3 A/C companies including AHR, only AHR realized the compressor was under warranty so we went with AHR. Unfortunately, after the compressor was installed, the technician noticed something was wrong (something another A/C company did not properly diagnose 3 weeks earlier).
AHR has excellent technicians (Darold and Matt came to our rescue). I thought the price we paid for the hours they were there was pretty high (the ONLY reason I did not give 5 star) but I did not have time to compare with an A/C unit out in August.