I rented a mailbox from this UPS store for six months. I never used the place for shipping, copying, key duplications, or anything else, but the employees were all really nice and professional. They knew who I was and which box was mine. I never had any problems receiving any mail or packages.
I needed the box because of a temporary living situation where we didn't have access to mail. The prices are high compared to the post office, and the address you get becomes obnoxiously long, but good luck finding a post office without a waiting list for a box. Things were a little rough at first because the store had just switched owners at the time we opened the box. But after a week or two, they got into sync, and everything was great.