I've had nothing but pleasant experiences with Chris and his incredibly competent staff at Tanner Motors. I found them a day after my 2002 S40 broke down in rural Utah; a local mechanic devised an extremely clever stop-gap solution and instructed me what to tell the independent Volvo shop (one other than Tanner Motors) to whom I regularly took my car in Phoenix when I was a student at ASU, so that the problem could be fixed properly. I arrived in Phoenix the next day and visited that mechanic, only to be charged $75 for nothing but a run-around story; essentially, he was clueless.
Imagine my relief when I called Tanner Motors: Chris instantly understood the situation, and fixed the problem permanently the next morning. I've been scheduling service appointments at Tanner Motors regularly when I visit my girlfriend in Phoenix... I have complete trust in their competence and judgment, and their prices are reasonable. If you live in Phoenix (or even visit regularly, as I do), don't trust anyone else with your Volvo.