I invested only few times so far, none of them turned out to be bad investment.
And you know the real difference between scam and real project?
There's no real difference, except that scam always tries to show themselves as the really solid and serious project. Serious projects spend more time on actually thinking how to make their idea live rather than trying to prove that they are serious and solid company =)
But people trust "solid projects" more. It's sad, that good projects are normally undervalued.

Check this out - whaproject.com
Read their whitepaper, what do you see there?
I can see that their idea is just awesome and revolutionary, I can see that they know how to monetize their idea. I see that they know how to implement it. But I see lack of advertising as well. Because, as I think, they've spent all the money on research and planning. It will be sad if their idea won't become very popular. I'm really following them as I will invest in that project for sure.

But I also see that their project attracted interest of some serious possible investor (at least I hope that it's as I see this)
Guy's name - Vince Kuraitis
Principal of this company - http://e-caremanagement.com/

So, awesome idea got announced, not advertised, and found it's investors in short period of time.
Will they advertise it any further? I don't think so - why would they if they already have investor?
I'm planning to invest in that project, I just hope I have time to do this on pre-sale when their token will cost nothing and they will even give extra 20% in the first day.

I actually found them here, on steemit
check @whaproject user