I already have a a DD2 for delay and really dig it. I was just attracted to the DL4 for the looper, 1/2 speed mode to get an octave down on drones and the reverse loop is kind of cool too. Is there another looper in that price range which may not have the quality concerns that come with the DL4? Does the RC 20xl have a half speed feature? I was looking at the Eventide Tone Factor but am kind of skint right now