Depending on your current available capital, and your personal risk tolerance, the opportunity could be fruitful or hinder you. T3 isn't fantastic considering Integra Capital which is under the T3 umbrella offers many options above and beyond the standard trader at T3. Risk based haircuts aren't that much different from portfolio margining. Except, with a professional account the clearing firm cannot change margin requirements on you unlike a regular broker dealer.
Hi Deltarisk what you mean by offers many options above and beyond the standard trader at T3. they look like a Fund Management company where as T3 is broker dealer... could you please elaborate
If you are outside the USA and want to trade stocks, you might want to check www.trader2b.com. Disclosure, Trader2b is a client of Trademetria.