This is the second fastest growing segment of action shooting. The men that started IDPA are all previously top notch IPSC shooters. Many of the IDPA competitors and the founding members were disenchanted with the direction IPSC had gone since its humble beginning with stock guns to the current Star Wars Blasters that dominate the unlimited segment of IPSC.
IDPA has a gun classification to fit almost any defensive handgun a shooter owns. This sport has also neutralized the high capacity ammo race, by limiting magazines to 10 rounds per the 1994 Crime Bill. You can actually compete with the same equipment you carry in real life. The shooting scenarios in IDPA are usually shorter and do not normally require the movement that IPSC matches do.