Hi all, I've noticed that my DL4 has begun making a bit of a popping noise at the point where the loop repeats. I don't know if this is something normal caused by the footswitch or if that same switch has just been stepped on too many times and needs replacing, but repair costs seem ungodly high ($45 intial bench fee plus $65/hr. for labor with an estimate of 2-2.5 hours of labor. For that kind of money I could buy a new DL4. So, while I'm considering that option I'm also considering other looping units. The Holy Grail, of course, would be an EDP, but that's not going to happen right this second. so I'm considering other options. I've read mixed reviews of the Boss RC20, but that one's still in the running though I'm worried about signal quality. A used Boomerang would be lovely, and I suppose I'd consider a JamMan as well, or another DL4, but I'm curious to try other units as well. Basically, I need opinions. Can you all help me compare and contrast these units? Thanks, j.