Hello and thank you for your interest. There is currently no bonus. You can invest now or roll the dice and hope for same or better price on exchanges later, it is entirely your decision. The number of tokens avalilable on exchanges will be very low initially compared to prior projects, however.
ICN is the only ICO that went over ICO price. The rest did poorly. Its a gamble but you can make some good returns if this ICO does x2 or x4 like some. I personally went in during bonus stage so I'm set.