This is the smaller of the two clubs at CLT. I prefer the other one (Concourse C) since the convenience of this one (Concourse B) compared to the other isn't obvious to me. I normally hang out at the club until it's boarding time. If I have to walk 5 extra minutes from the other club, I'm ok with that.
That said, I get the key benefit of club access when I'm here. I don't have to fight for a seat and hunt down power outlets. All the free food and drinks are just a perk that wouldn't necessarily sway me to "pay" for access.