I prefer Grip-Shift for my folder because it keeps them out of the way when folding. There are fewer "sticky-out bits" to get snagged when folding the bike and stowing it in a car. The Grip-Shift isn't what is causing the need for extra "oomph" when changing gear, it's the angle of the cable that makes it more difficult than it should be. The SRAM Rival front changer is what Xootr supply in its conversion kit.