If someone doesn't use CO2 regularly to remember how to do it right, especially with the frustration of a flat. CO2 with a trigger is ideal for infrequent flatters. A mini pump is good to get a flat started, check for the source of the flat before putting the new tube in, and as a backup. But CO2 is key to me to getting the flat fixed and moving again - its a few seconds to get up to 110 lbs or so versus a couple minutes with a mini to get to 60-70 lbs.