Ridiculously friendly staff that has insight on different foods, supplements, treats to offer your four-legged friends --- the food prices are on par with big box stores but they offer frequent buyer programs and lots of coupons in the mail... (ask to sign up for the mailing list) Small, easy to get in and out and customer-centric --- I like the late hours, even on weekends (which is usually when I panic and realize I don't have enough dog food to get me through Monday, much less the week).
I've found a few of the items (some toys etc) are cheaper elsewhere but if you're smart about it you can save a lot of money and it's my favorite pet food store in the area (and there are a lot of good ones around here).