Questions about PE

Hey Guys,
Hope you don't mind a couple of questions from someone new here
Traveling to LAX on the first May with my best friend and have paid to go PE out and Econ back.
Looking at the return flight its 157 to upgrade to PE, is this worth it on a night flight? we was hoping to do Upper but the prices for LAX didn't seem that great in the sale so we chose PE out.
Also the clubhouse looks amazing, does anyone know if its possible to pay to access? if not any tips for places to eat/drink in Terminal 3?
Anything else I should know about PE? I have only flown with Virgin once before and that was Econ to NYC.
Hope you don't mind a couple of questions from someone new here

Looking at the return flight its 157 to upgrade to PE, is this worth it on a night flight? we was hoping to do Upper but the prices for LAX didn't seem that great in the sale so we chose PE out.
Also the clubhouse looks amazing, does anyone know if its possible to pay to access? if not any tips for places to eat/drink in Terminal 3?
Anything else I should know about PE? I have only flown with Virgin once before and that was Econ to NYC.