I've been a member for over a year now and I'm pretty happy with BJ's. I like how they send out coupon books, have in-store and online coupons as well. It's a great deal when you buy with the coupons. They also take all manufacturer's coupons which Sam's Club and Costco do not. They also accept all credit cards, while Costco only takes debit and the Costco AMEX.
The deli is great and has a nice selection of Wesley Farms and Dietz and Watson meats and cheeses. Both brands seem to offer similar items, but WF is $1 less per lb.
The bakery is very good and I like their rolls and cookies.
I wish the meat selection was as good as Costco's though. Also, their seafood selection is limited compared to Costco.
This place is definitely not nearly as crowded as Costco can be either.
For now, I'm happy with BJ's and will renew my membership but I may switch to Costco in the coming years...we shall see.