As a CFD I get a spread of about 1/2 a point with no commissions.

If you trade the futures version (ES) you can get 1/4 point spread with $5 commissions. Its a little better value. I don't like that they use FIFO for your trades. They may also call it "netting" orders.

Anyway, I scalped the US500 today and grabed about 2%. The price movement is smoother than US30.