The only possible drawback of this, might be the fees that are charged on top of these transactions. Some of these services charge exorbitant fees on their services and this kills the incentive to use Bitcoin as a cheaper alternative. We should remember that one of the reasons we are using Bitcoin as a alternative, is for the cheaper transactions.
The Pro's with this is, convenience and easy access to Bitcoin and increased exposure. ^smile^
I hope charges is minimal that will not turnoff future bitcoin holder or not expensive when using or dealing with bitcoin. So far this is another great news for bitcoin community as more people are using it, it creates more demands and market.