One question that is often asked is what is the best ultrasonic rcm? The consensus seems to be that the Degritter is the nicest one, and the HumminGuru is the most practical one, and if you have the patience to go through the whole process you’ll get the best results from the Kirmuss. I did a lot of research and corresponded with a guy who owned both a Degritter and a HumminGuru, who told me that although he preferred the Degritter because it was just so much nicer, he could not hear any difference when comparing the results provided by records cleaned on either one. Mikey Fremer, among others, reports hearing a difference in favor of the Kirmuss, but admits that he doesn’t use it unless the record means a great deal to him because the process is so time consuming. I bought a HumminGuru and like it, but find that I use only on new records, preferring my VPI machines for old records, because almost invariably, the VPI is significantly faster and usually removes grunge that the US process either struggles with, or can’t remove at all.