When I received the racquet and first strung it, I went out to play and totally forgot to put the bumper cap back on. To my surprise, it felt awesome because of the head lightness although without it seems to give the racquet a bit of vibration at the top even with a rubber band. However, I love the feel when I can whip at the ball. I've been having arm problems so that's why I like that feel. Then I put the cap back on the next day and man, the racquet felt heavy and I can't seem to swing as well with it. I was wondering if any of you guys have tried hitting with the PC without the bumper cap. Is this unusual? I'm using the MP standard version.