Hi,
I’m a complete noobie with AS and hoping to check my thoughts on Premium Class upgrade.

I am BAEC Silver so Oneworld Sapphire and made a rewards booking through BA. Flights are AUS-SEA. I’ve been able to select exit row seat in elite section at no extra cost.
I’m being offered an upgrade to Premium class for $75 which I’m kinda tempted to do, but I’m not sure it will give me much benefit?? Possible slightly more leg room?? As I understand it, I will be able to get beverage and early boarding??
And a separate q on food. What are likely to be my best options if I want to get something to eat?

thanks in advance