I looked at the Grip and Pull bullet puller when I was in the market for one. I looked at RCBS and Hornady bullet pullers also.
Since I went to machinist school and worked in a machine shop and the light bulb industry, I look at things with a mechanical/engineering mind. The collet on the RCBS has to be tightened enough to pull the bullet the first try. If not tight enough, In pulling the bullet pulls on the collet and loosens the grip on the bullet as pressure in added. This could cause scratches on the bullet. The hornady bullet puller with the lever handle tighting system, is better. Since it has a reverse tapor, As pressure of the press is applied to the shell, The collet pulls tighter and grips the bullet tighter. On some bullets like the Hornady V-Max it will make a fine line circle around the bullet. Yes, My impact puller is somewhere collecting dust in a closet too.