Centrally located in midtown at the Met, BJ's recently opened up the world of warehouse shopping to many. Previously, the closest locations were too far from center city. The membership sales team has been slanging memberships at discounted rates to lure new shoppers in.
+'s:
Location and convenience
Use any major credit card
Use manufacturer coupons (stack on top of BJs coupons for more savings)
-'s:
Selection is vast but Costco's is better
Smaller sizes of items = lower unit price but Costco prices are better
No gas station
Overall: I much prefer shopping at Costco but the convenience of BJs will win out sometimes.