Have you invested on it before and got your money back as well as profit?
I haven't and I may never try. Because Its not just one person who says they are lying but its actually true that Cloud mining are just scam. Since the dawn of time people had been discussing about this being scam. You search up those topic, it could give you an idea.
I have used hashnest some times in the past, worked well. Was able to cash out and resell my mining power in the end.
Unfortunately the BTC and LTC mining power they offer at the moment is not very profitable due to increase in difficulty.