Take a look at the cities/airports covered. If you trave;'s covered. it CERTAINLY is worthwhile.
I am a former airline staffer who travelled the world regularly in business & first class, but had no access to lounges - this was my colution.
I did a deal with my boss (who rrightly refused to pay for the membership) who agreed to pay me the equiv. of single entry fees where I would otherwise have been entitled to a hotel room and for my own convenience, chose to freshen up in the Priority Club lounge.
Work it through with your boss.
Lounges certainly vary in size and available amenities/services. But they're up-front about it and give you a detailed membership guide when you join.
They're run by ICLP which are a very reputable organisation who runloyalty programmes for many travel suppliers and airlines.