I believe you can as many people here use IBFX such as James16, myself, and many others...Best thing is to demo, start with a small account (even micro minis) then try smaller level real trading. Get a feel and trust your instinct.
the main reason i started trading with them was not really trust although so far i have been impressed. they dont have an in house dealing desk so supposedly they dont take trades against you. this combined with the position sizing available on met4 was enough for me to give them a try about 3 months ago. so far so good.