A good decision if you want to buy Bitcoin when it is in low price. If you can be more patient, you may be lucky to get cheaper price once it it in read price. As long as you buy the bitcoin before the price is rising, It is good time and right decision. While if you are sure the price has been rising, you may be better to stop buying and prepare to sell your coins gradually. I believe a smart trader knows best time to buy or to sell his coins.