The average return for week is looks like 0.8%, I think it not a good investment as it takes time to double investment. Online investment is always risky. People who have patience can try.
If you're expecting a 150% over night "bitcoin doubler" rate, you're in the wrong place here.
Bankroll investments are one of the best chances you'll get for legit bitcoin investments, and the average return rates are pretty decent when being compared with other (legit) ways.
Of course none can keep up with the return rates scams offer, because...well, they can claim whatever number they want.
150% in a day, 3% daily up to 250%, 50% every week for 4 weeks, 1500% after a month, seen it all.