This product is very similar to the Perfect Cover but is not as thick & leaves a dewy finish. I have both the Signature Real Complete as well as the more popular Perfect Cover & I'm going to compare the two since this is more expensive than the Perfect Cover. They don't differ much so if you don't want to spend the extra money, just get the cheaper Perfect Cover.
DEWY FINISH: The Signature Real Complete BB Cream goes "glowy" on me after it sets. I have very dry skin so to have a foundation look dewy on me is actually very rare & I really like it! As a result, I have a feeling it will look very shiny on those with oily skin. The Perfect Cover does not have the same effect (not as dewy).
CONSISTENCY: This product is more watery and less thick than the Perfect cover. This makes it easier to apply and slightly less cakey looking.
Overall, the difference is fairly minor and although I prefer the this product over the Perfect cover, I'm more likely to buy what's cheaper.