Depends on time of day WRT meal v snack onboard.
By all means spend time in the lounge to eat or drink (alcohol if after 12.00) if it is your first time give yourself an hour or so to enjoy the lounge.
There is certainly enough to eat/drink to enjoy and more than you will get onboard the flight.
It really depends on how long you want to stay there. I have been forced to be there for up to 4 hours - there is not much to do once you have grazed the buffet and facebook.