Last summer a test was done using top calibre players in tennis and golf to determine how much feel these people had. Raquets of various string tensions were provided with different types and composites of string construction. All raquets were the same weight within the sizes of frame head provided and there were different flex of raquets used as well. Key to this test was that players did the test under nomal playing conditions however two types of tests were done. In the first case the players hit with no altering of any condition. In the second the players had ear plugs that had a small amount of noise transmitted through them to completely eliminate the sound at the moment of contact with the ball. In the first case nearly all the players were able to identify the tighter strung raquets and the stiffer flexing raquets. In the second case a very small number of players in very extreme cases of flex, either very soft or very stiff, and string tension, very tight or soft, were able to correctly identify these factors. After the 100's of tests done the research engineers concluded from the data that 80% of feel comes from your ears or sound made at impact. If you feel the sound made by a raquet has that great pop when you smash it then the tough part would be convincing yourself to play with it when it's a medium flex at 20lbs. when you think you should be hitting a very stiff raquet strung at 26lbs.