I am using the A/V RoomService EVPs. I have used Herbie's Tenderfeet under a number of devices over the years. I also have a set of Daedalus DIDs. I much prefer the EVPs under the Lumin X1. Though I have noticed this prior with these other feet, slight position changes do influence the sound presentation, and seems more noticable to me with the EVPs. I liked the results enough I also ordered a set for the X1 power supply and my SonicTransporter i5 CDR. While really noticable under the X1, I am not sure about effect under the power supply, though I continue with them there. I do like the changes with the SonicTransporter.