Other reviews in here and other websites compelled me to try out the Grand Prix, and I'm glad I did. I have mostly stuck with Wilson US Open and Penn Championship balls 'til now, and I have found the Grand Prix to last much longer than those. It does have a slightly heavier feel, but not by much. You'll adjust to it quickly. I also found the ball's extra bright color helpful, but that lasted only about an hour. After that, the accumulated dirt makes it look like just every other ball. Overall, these are my new favorite balls, and probably the best I've ever used. Would definitely recommend others to try it. I know it isn't readily available in retail stores, but it's worth it to order online and wait.