I found two reverbs being sold. One of this is quite known here. It's the Yamaha Rev100. The second one, the Yamaha R100, apparently is no longer produced, I'm not sure. Some people mark the R100 as a very nice reverb. As for the Rev 100, I didn't find that people appreciate it too much. And I can draw a conclusion the R100 might be better in the price/quality regard. Can you please give me some more information about the R100? Or about Rev 100? Is one of them good enough to buy it used for nearly $120.