My apologies for asking something that's probably been asked many times, but I didn't find a clear answer in a similar enough example.

We're painting a bedroom, the walls are currently Behr Toffee Crunch (700D-S) according to the leftover paint cans, and we're looking to paint to BM Aura silverly blue.

I've never used Aura before but have heard lots of raves about it, and if it saves time and requires fewer steps/coats I'm wondering if the increased cost of Aura would "pay for itself" so to speak compared to other brands where I'd expect to need to prime plus two. Should Aura cover this in two coats? Is priming first necessary (Aura advertises being self-priming, that true)?

I'm thinking if priming plus two coats is necessary, I might be better off saving money using a more standard paint, but if it saves an additional coat and time, it'd be worth it. Thoughts?

Thanks,

Marc