Ok these balls are heavier and that is what makes then illegal. 1.67gr is legal these are 1.8gr or so. For the slower under 95-100 swinger you may not see much improvement, but for the 95 up guys of course you will it's heavier. For the 95 and under guys Nitro makes one they call the Eclipes in a funky 2 tone . But for the price give the LD 20 a try you will have fun with it and that is what the game is about. Hey the long putter is cheating and everyone knows it, but are you on the Tour?