Something for nothing (since it is your work card) is always good although the lounge access from Diners is far weaker than the access provided by Amex (for non AU issued cards) or from Priority Pass, or from QF membership, or pretty much any other way you would get lounge access. Diners should really just give up and bundle Priority Pass with their cards rather than trying to maintain such a fragmented, tiny, lounge network.
I love the fact that they list USA but then it turns out it is 2 cities (Miami & Newark). There are also weird things like Tokyo is Haneda airport only, nothing in Narita.
Still - it is a free benefit of something you get from work - just don't expect too much.
(On a side note, my last Australian employer issued Diners Club for work - never understood why, since its acceptance is worse than any other international card - although maybe that was their idea, limit spending by limiting acceptance).