I'm a member of both Sam's and Costco. I get gas at this Sam's every couple of weeks and visit the store once or twice a month. I've had very good expereinces with the staff the last several times shopping here. I also attended there pre Black Friday event where you could upgrade your phone for an inexpensive price.). I was very happy with how organized everything was with the process. They made appointments for everyone and also had a complimentry snack cart for the early birds who were waiting outside in the cold to get it.
I also eat at the snack bar and the place is almost always a madhouse. The snack bar staff works incredibly hard to serve everyone. Overall I feel the staff here does a pretty good job. I think the merchandise as a whole at COSTCO is better but have no problem shopping here.