We have used this lounge a couple of times, but would probably not do so next time round.
It's fairly small, can get very crowded, and the snacks and drinks are not great. In our view, we would rather spend the money on a decent meal in the main lounge.
The only benefit would be if the flight were to be delayed, in which case you can pay at the door. Even then, I would be undecided.
It's not that great a deal, and nothing like proper lounges at other airports.