It's medium creme blue, it's perfect to apply and it is opaque in only one coat.
The closest thing I have is Catrice Blue Cara Ciao, also opaque in one coat, but I like OPI more because it seems to me it could last for a week without major tipwear.
I never wore it for a week tohugh, since I still have some untried polishes I don't want to keep waiting to be worn, even though I haven't bought a polish in months (trying to cure my obsession).
On its own it's perfect, but I always enjoy some stamping too.
What's your favourite blue?
I know that's a tough question. :)