I heard a lot negative about those presale coins..ICO?
They are in most cases a scams.
Yeah, but think about this: Nxt and Ethereum have both done ICOs and it was a big success. Especially for Ethereum.
Probably they will be in front of Litecoin by end of this week.
So ICO = scam is not really the truth. The guys that are building IOTA are even known by their real name. It also seems to be that they have a good reputation in the community. But of course, you don't know if this system works. It's the first crytocoin without a Blockchain what could bring some risks.
If you want to buy the Top20 of all Altcoins with just one trade you should think about investing in Coinoindex:
http://coinoindex.com/Nix uptrend since some weeks.