I've been dying to try out the Natural MSFs but held off b/c I didn't think any of the colors would match - Medium seemed too light and Medium Dark seemed too, well, dark. I recently went to Mexico on vacation and was determined to not use anything too heavy and decided a Natural MSF was the way to go. I'm NC30 and knew I'd tan (despite repeated reapplying a high PPD sunscreen) but also knew that when I came home that I'd need something that could match my faded tan skintone. Medium Plus, with the N Collection, has filled the gap (at least for me). My forehead always tans darker (and stays darker) than the rest of my face so I wanted something to even out my skintone and provide some light coverage - and Medium Plus Natural MSF did the job. Good staying power, both in Mexico and at home. It's obviously not waterproof but I didn't expect it to be either. This provides more coverage than a loose powder and not as much as a light liquid foundation - a nice in-between option. It looks natural in sunlight.
Drawbacks: this oxidized slightly in a warmer climate but this was decreased when using a lighter hand; the light finish of the powder is deceiving - you can get quite a bit of coverage without using too much. Also, this can look a bit too dry and powder - so either moisturizer really well, or set it w/ MAC Fix+ (finally! a use for this!). I wish the packaging was a bit sturdier b/c I know that the MSFs are hollow domes, and can break easily. Overall, I'm very pleased with this product and would repurchase. For reference: Asian, yellow-neutral skintone, NC30/Chanel Shell/GA 5, brunette/brown hair.