Most products allow you to beta test or even just trial their system out
. And then most importantly you'll want to figure out what the per trade fees are like, and you'll want to factor that into your business plan, make certain that the system abides with your metrics for profiting on a daily, weekly basis. Once again, you're system has to tune well into the goals you are trying to accomplish. The area of technical analysis software really is a personal one, and it really needs to conform to you and your trading style. If it doesn't, you're bound to start making a few bad trades and slip up; the relationship with the system should be fluid.