While they may have "no problem", any program would say they honestly prefer the USMLE...as being the only one posting here that actually went through the process, PD's would like to compare apples with apples. Though the PD of maricopa is a DO, he did NOT take the COMLEX as it was only introduced in 98 or so...interpretation of the COMLEX vs USMLE is difficult...our chair of the Dept yesterday made a joke and stated "yeah, he got a 98 on his COMLEX!...whatever that means?" it was quite funny, and further illustrates the problem of interpretation of test scores.
Phoenix is a wonderful place, and Maricopa is high profile...but the ED is TINY and hectic. I interviewed there, the residents are very happy, but that place is hard to work at.