I worked for an Advance Auto that was in the same building as a Pep Boys service center. The Pep Boys used to have parts and service in the same building and when they got rid of their parts stores, Advance bought the retail space and opened shop. We sold tons of parts to Pepboys and I got to know most of their employees well. They had a couple techs who were pretty good, and several who were not. High rate of turnover on lube techs, as to be expected. Service advisors were hit and miss, one was exceptionally bad.
Quality of service will be very location dependent, like most big repair chains. Just depends on how good the techs are at that location and how well the manager runs the place. They are probably fine for state inspections, tire mount and balance and oil changes, but personally unless I knew who was working on my car, I wouldn’t use them.