Previously, it was possible to make very good money on early investment, but now with so many scams it is very risky to do it.
First the scammers. Second, the market is too weak for good x's. Third, investing at an early stage will have to wait much longer!
It's best to wait a bit before you invest in a project, if you buy an ERC20 token in an ICO just because they promise they'll do things, then you're most likely going to regret it.
A team has to prove it's capable of fulfilling their roadmap and to have done part of it already. In that case however a project's price has increased a lot and investors have lost a big chance.
In XDNA's case, the team has proved they are capable of great things! XDNA had 2 big updates (hard forks) in such a short time, both of the forks happened without an issue. Because of that the price increased but (1) their bigger plans are yet to be implemented and (2) today the whole market had a decline and XDNA had no different fate, so it's still not late to buy just before the new platforms roll out!