When I tried that myself with Easy and euro50, the main prob I had was no chart. (market eye didn't do it). One of the guys at Easy2 gave me his password for one of the charting systems he uses personally, but to be honest it wasn't very good. If you can get a live chart to go with the feed everything should be okay.
I think IB do the feed, and if they do then you can get a chart from Sierra. I believe you can demo a chart for a short while if you haven't already got an account with these.
Out of the 2. I think IB has it for speed of trade.