It's a good option. It solves some of the problems like early dumping of coin and the team taking all the money and going scam. Going scam is an intention and may not be easily avoided but when there is low supply, the price does not decreases sharply. One of the shortcome could be if not studied and placed according to the need, the team may face cash deficient as a fixed amount of money is only released. This could even be solved with the governance of coin, investors should be able to vote in order to release next batch of coins to the team or not.