I'm going to let the photographs do the talking mostly as I don't feel the need to go into great detail.
Like all Mac lipsticks this has a soft vanilla scent that is not detectable once on the lips.
Perfect Day is a Amplified formula which means it has high colour pay off in one clean swipe!
It feels moisturising on the lips with a glossy finish, a really lovely formula.
I typically get around three hours from Mac Amplified formulas. 

Mac Perfect Day is described as "a light neutral pink" which I agree with to some degree
but think it is best to say it is a pink based nude and of course such a pretty natural shade.
It is really flattering and a shade I see flying out the stores!
I'd actually be shocked if this doesn't sell out in all honesty 
as it is the stand out shade out of all four lipstick shades!

Available from Mac stores and website for a limited time only - link