Review (2/5): I don't see how it is better than no base coat
For me, the color nail polish coat adheres to this fine (why wouldn't it?), but within a few days the base coat separates from the nail. I'm not sure what the advantage is versus using no base coat at all.
Update June 2014: It might not be the product's fault. I learned that some people have naturally oily nails, just like hair and skin can be oily, and this would inhibit good adhesion. I'm supposed to de-grease my nails with alcohol first, and then base coats should adhere better. When I get around to trying that I'll post another update with my results.