I've tried out a ton of loopers and honestly I still think the best one is this:
It's hard to find though, been replaced by a newer model that doesn't have some of the clever features that drew me to this one.
You find them second hand occasionally but they're not cheap, however in my opinion they are hands down the most functional looper on the market for if you try to incorporate looping into your live act as a band, it's still really great for solo but all the modern features of things like the RC-300 with independent fx on tracks etc may have a slight advantage there.
