I think it really depends on how often u fly and what airports you regularly use.
I have lately found the clubs useless for my needs because of the long check in lines and gate waits.I travel Intl frequently and the hassles with boarding these days won't even allow me time to enjoy the lounges, domestically I find the lounges too **** crowded unless I am flying a red eye. I have found if I do have any extra time before boarding it is better spent waitng at the empty gate next to my boarding gate.