I have a VTL S400 that is similar in design to the Siegfrieds I love it. Like the reviewer from IAR, it completely disappears. I did make one huge improvement. I was lucky enough to find 12 NOS GE 6550's (still had the VTL logo on the them). They made a huge difference-I could not listen to the "stock" 6550's after I changed them. If you can find the GE's give them a try (kind of expensive and you'll need a lot of them)
