I liked my KBT in stock form, but I felt like there wasn't enough "pop" on my groundstrokes. When I hit a ball, the frame just seems to absorb the ball and sling it back. I decided to put two grams of lead to the head, and two to the handle (to balance things out, although I'm not sure if what I did is truly "balanced"). This was the first time I'm playing with lead, so I decided not to add too much. At first, the racquet felt noticeably heavier. It was hard for me to whip out my arm to get pace and spin because of the additional weight. However, after an hour, I adjusted to it. The racquet felt firmer, with more pop. I'm using Big Ace strings with a Smiley Face damp, so the overall feel my racquet is mushy. However, I felt like I just applied a harsher "worm" style dampener. The vibration was a bit more muted, but the POP was louder and sounded crisper. Also, the power was incredible. Here's a question though, how cautious should I be with the lead tape? I did all the cutting/applying with latex gloves on, and throughly washed my hands/scissors/ruler/pencil afterwards. I'm pretty paranoid... But really, how dangerous is it?