I'll opine.
My experience with wine clubs is that, for the most part, they are not worth the commitment. We joined several clubs after a Napa visit (Far Niente, Schramsberg, Robert Craig) and I stopped them all either due to cost or that I could easily find their wines in my town - and at much better price points.
The only one I have kept is Sineann (Yamhill County, Oregon) because I love their wines and and I never see them on the shelves in my town.
If you are into library options (previously released vintages) and large format bottles or plan to be in Napa often, then a wine club and the commensurate discount benefits may work well for you.
If you just like good wine and are willing to shop around, you are probably best suited at Binny's.
I wish I had a Binny's in my town!
Davooda
Life is a garden, Dude - DIG IT!
-- anonymous Colorado snowboarder whizzing past me March 2010