prosticks is not stable enough for trading.. it hangs a lot during busy hours. won't continue subscription after my current one runs out. they used to be fine before the upgrade to a new version. I'd rather use sierra chart or quotetracker now. all you need is intraday price action, plus some long term charts (such as futuresource.com), just make sure not fighting overall trend and major S/R.
FWIW: IRD told me they do not offer service to US based US citizens. Bummer. Esignal has foreign exchange service and IB interactvity.
I usually don't get logged out until 3:05 to 3:15 central time. Unless you trade afterhours, you should be fine.