The RSI is a momentum indicator that will provide you with the information relative to the timing of an entry into a trade by letting you know if bullish or bearish momentum is developing. Now, how good RSI is will depend on the knowledge and understanding of the person who uses and interprets it; just as the success of a golf player will depend on his/her own ability than on the golfing instrument or area. On its own, every indicator presents a valid representation of how the algorithms behind it interpret price action. I will advise that you study the RSI extensively because how well you learn to use it will determine, to a large extent, how successfully you will trade.