Are the simple 50 buck, import scan tools, just as good as the 300+ type? I know that the more expensive type have more features but are the cheaper ones accurate? All i want to do is find out why my SES light turns on and fix the problem, i dont need all those extra features. If i buy the 'made in china' scan tool, am i risking messing up my motor(97 Z28)? Thanks in advance.