It's to much of a risk. I would say if you want to make 10% on Bitcoin or a profit. Do it yourself. I wouldn't trust anyone with my Bitcoin. Because a) it's very risky b) Most people offering these services are newbies, because others with reputation find this a very risky service.
OP, if you lost our Bitcoins would you give them back with the 10% profit? Because in the title you are indeed saying "get" 10%. Which to me means you guarantee you would. What would you do if you lost peoples Bitcoin?