I played with a headrush pedal. The double speed feature on the looper sounded amazing.
On the Kemper remote, it kinda dissapointed me. It is not just the thing you played on the guitar times 2. But it changes the sound completely. As if the sound is modulated by a Digitech Whammy. The feature comes in handy for me. I like to practice fast licks/riffs that I came up with. With this feature I will know if it sounds bitchin'.
In short: with the Kemper my friends won't believe I play as fast as Nuno Bettencourt, but with a Headrush pedal they will. The 1/2 speed (or double) needs an update.