I was a Sam's Club member, but we only went when my husband was able to go, and unfortunately he's an impulse shopper and doesn't make good use of the membership. The closest store is 45 minutes away, so with those two things combined it's not worth it for me.
There's a good article on this very subject on FC called
Is Warehouse Shopping Wearing Out Your Wallet? that addresses a lot of the points being mentioned here. It has some
really good tips on determining whether warehouse shopping is for you or not. Check it out.