Sam's Club was among the highest-rated companies for customer service, according to new research from the Temkin Group. Other retailers included Publix, Hy-Vee, H.E.B., ShopRite, Aldi, Giant Eagle and JCPenney.

Target may be investing in expanding its offering of fresh food under its PFresh remodeling initiative, but it has a long way to go before it is considered a top grocery destination, at least according to a survey from Market Force Information.

Sam's Club has the most loyal customers, according to a new study by Temkin Group. The report, "2012 Temkin Loyalty Ratings," rated the loyalty that consumers have to 206 large companies across 18 industries.