Are there discount for early investors? Are there big investors already behind this project?
Giving the earlier investors discount is a must for ICO's project. Without it, such ICO will be hard to get supporters. I hope repu will offer it too!
Well a small discount is ok, but recently you can see so high discounts, which brings in a lot of dumping in the beginning. I would prefere a small discount or rather none, because if someone is interested in a project, he will probably also get in with none discount.
Considering their max. bonus in the presale of 15% for contributions from 5 ETH upwards I think there won't be a huge bonus, if any.