Depending on what type of trader you are, will help you make the decision on whether you should purchase a trading system or not. There are several factors that go into it and you have to take an honest look at yourself and decide if that is the route that you want to go on. Some people thrive in setting up a system that will do the same calculations that they would do anyway. Why do a trade manually when it is the same exact trade that you would do anyway. Let the computer handle it for you. But some people trade based on more than factors that can be calculated by the computer. There is a level of gut instinct that they listen to before they make the trade. So if you go by gut instinct, then a trading system might not be the best thing for you to use.
Unfortunately, some people believe that once they get a trading system running, then they can just set it and forget it. This is not the case. The computer will just make trades based on the conditions that you set for it. But if those conditions change at any point, you must prepared to react to those changes. You must be willing to be flexible and change the variables that you are using in the system. Now remember, we are not saying that anytime that there is a small change that you should rework your system. Not at all. The purpose of having a trading system is to get you away from second guessing yourself. We are saying that you should not rely on the machine 100% and get ready to make changes if something very drastic happens. This is not often, so there should be no need to worry.