I have a small account with them now. I stopped using them when i was trading with Yak's group and I had a hard time shorting as they are frequently unable to do so (even on high vol big board stocks that you should be able to short).
As far as investing and swing trades, they're fine to use and cheap and I think bobby boca uses them for option trading.
Their customer service is excellent. I have complained before about them on my stock twitter account and next thing you know (within an hour!) I get an apology email offering free trades.
So the shorting aspect was the only thing I had issues with as I hated missing opportunities.
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