I had seen the one of the left on demos but, was unable to buy it because they stopped making that series. I got lucky and found this used one. Before that since I could not get the original one I went with the nano Double Muff on the right. It actually has a tighter sound. It is also a great pedal. The tone of the original has that "EHX" signature tone I like to call. The nano ones don't have that but they are still great fuzz/dirt pedals. The original is not true bypass, so I have to have it at the end of the chain when stacking. It is also a noisier circuit than the nano version. I have a number of EHX pedals. They make good products. I'm curious about the Germanium Big Muff. That might be a good pedal as well.