Yes I have used IQ option, but not for trading Bitcoin; I was trading other assets and currencies like USD, Gold, EURO, Oil and the rest of them, though there wouldn’t be any difference when you decide to be trading bitcoin on IQ option since they are all the same.
IQ option is an options trading platform, so you have to bear that in mind and it’s a lot different from the normal trading of cryptocurrency. As an options trader you’re given the right and not the obligation, and you’re only trading with amount you have invested for the action you take, and you’re not really buying the asset, you make a prediction and if it’s right you get profit, if not you will lose money. From my experience then, their platform is good and you can even deposit and start with $10, although I don’t know if they still do that now.