I saw an online review/usage of the more expensive 452 and was impressed enough to buy it. Was a bit worried when it arrived because it was quite small. Tried a 225/75R15 horsebox tire which with all my old tricks (old manual fender, hydraulic jack and straps, swearing) wouldn't budge. This thing broke a pearl like a pro. The rear had to be rearranged in four places, but with a percussion this was done quickly. Both beads broke in about 10 minutes. Buy this tool!