No, it shouldn't be safe to invest. This is another scheme that ends in a 'hack' or simply in closing the website and the owner leaving with the millions.
It's just a way you can get rich fast: stealing. They promise '10% forever' - invest 10BTC. That means 1BTC profit PER DAY. That's too good to be true, and sadly.. people are investing and loosing. You will see the website being 'trusted' around the web. Trusted = need of referrals, or the owner spamming the website all across the Internet.
With the calculator they have on their website..... 15% Daily Forever + 25BTC investment = almost 1400BTC. Almost 1 MILLION USD. Isn't that TOO fishy?
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Don't invest in it!