FYI Mach2 is before immigration & security. It's a good option if someone is coming along to farewell you.
Last I checked the menu looked quite average. And the beers even more average (the name is a hint!)
I quite like the House, I'd put it about on par with QF J. Smaller but has a much better view. Can get crowded at times. I've read sometimes they want a co-pay on top of the Priority Pass? Not sure what the deal is there, probably wouldn't pay extra to go in.
Plaza Premium is tiny but has a reasonable offering for its size. It's often closed and Priority Pass or Plaza Premium guests are directed to the Skyteam lounge which is directly below - much bigger, about the same F&B, can sometimes be a zoo.