My own observation (based only on what I have seen only at my local L&M) is that 810s sit there for a long time. Even the used ones that are going for a reasonable price. But it seems like they sell a 1510 about 3-4 times a year. And the rare used ones that show up never hang around.There is a reason that Traynor makes that 1510. And there is a reason that it is so popular.