This IG review will give you the facts about one of the most popular online brokers. As a U.S. foreign exchange and CFD broker, IG has a lot to offer traders looking to start a profitable career in the financial markets. They are well known for low spread costs and their emphasis on customer service, education, actionable research, and functional user interfaces. They are well positioned to compete in the online broker market, but some people may be put off by their lack of legality in some states, including Ohio and Arizona.