Really i don't think is ok to invest again on ICO, this is just my opinion and anyone do what they want with their money, but some IEOs can bring a profit in my opinion even if this can take more time.
ICOs are now having hard time to raise money.
On my end, I really don't look for an ICO project anymore but if something catches my eye, I bookmarked it and once it hit in the exchanges, maybe I'll buy some.
The price in the exchanges is pretty good deal rather than ICO prices.
But you should check for the potential of the project because most of them will die down after couple of months of trading.
IEOs on the other hand, are better deal than most ICOs because you know they will be listed after IEO.
But still, you should know what you're doing, else, you will also lose money in this kind of crowdfunding scheme.
I can't vouch for any ICO or IEO project as the risk involved is very high. It is up to the investor how he will assess the project on hand.