The shade I use in this is C4 which works well with my NC42, Olive/Tan skin tone. This shade is perfect for the inner parts of my face (cheecks, nose, etc) but a tad bit light for me around the chin (due to my hyperpigmentation). But honestly, this foundation is so sheer, I can't really see a huge difference. I would however say C5 is a much better overall match for my skintone and would choose C5 when I do repurchase it. I think you could easily get away with using a foundation a tad bit too light or too dark for you because this foundation is so sheer. For reference, I'd say C4 is best for NC37-NC42 and C5 is best for NC42-NC44.
BEFORE: Excuse my bare face (eeek :$ was recovering an acne-attack) |
AFTER: Concealed, followed by 2 layers of MAC F&B and powdered. |
This foundation also gives you the most bang for your buck if you buy the large size as you get 120 ml or 4oz for $40 CAD (Smaller size is $30 CAD for 50ml). Other foundations on the market that are along the same price range, typically give you less than half the amount of what F&B gives. Even though, I've used this foundation (occasionally) for more than a year, I still have 80% of product left. It is said to last for about 2-3 years before it goes bad and it's life can be extended if stored in the fridge. During the winter months, I keep it in my makeup bag or dresser but in the summer months I store the bottle in the fridge and decant some into a smaller container that I can regularly use.
MAC F&B is also amazing for flash photography as it doesn't give any flashblack or any white casts. Therefore, I'd say its best for night-outs or weddings as it doesn't have a sunscreen in it either. It also looks exceptionally natural in sunlight as well. However, it does have quite a shiny look to it, so its best to always set the foundation with a powder (I use MAC MSF Natural in Medium Dark). Because of the shiny finish, I would say its best for normal to dry skin and slightly oily skin.I can't speak too much about lasting power as I never really used it for more than 4-5 hours and never experienced any fading away.
So there not much left to say except that I love this foundation & totally recommend it!