I'm currently using two platforms: ThinkorSwim, and TD Ameritrade. My trades on TD Ameritrade execute fairly quick...but on a -300 pt down day (like today Feb 29)...had a little snag logging into my account. That may be a downside to TD Ameritrade. But I'm still on the lookout for a nice platform that will give me great 1 minute charts. ThinkorSwim is great for the Swing trader, but the intraday charts could be a little better.