I am one of the people who were a little sceptic in the first place. Now that i've tried several tweaks I am convinced it really works big time. I am not talking about subtle differences here. The improvements I got were huge. Even my parents heard the difference and they are inexperienced listeners. My system consists of the following components: AMP: Denon AVC-A1 SR (AVR-5803 in US) Speakers: B&W 640i(front), MS 905C (center), B&W 604 (surround), B&W 602S3 (surround back), Rel Storm. CD:Sony CDP-XA 3es MD: Sony MD-500 DVD:HK DVD-1 VDP: 2 x Pioneer CLD-925 Cables monster/Audioquest My system isn't as expensive as a house!!! I did the following mods to all sources: Selfadhesive lead to make the source components heavier, damped the cd tray and and covered the crystal clocks with kit. DIY powercable (Lapp cable). My CD player was upgraded with a new more precise digital clock with buffering and new coaxial digital output. My cd player is connected via the coax buffered output to my Denon. I A-B with my modified 925 and DVD-1. A friend of mine has got exactly the same. The difference was striking. It made his gear sound flat and compressed. The bass is much tighter and controlled, the mid an highs are sweeter and the overall soundstage was wider. I have to say that the biggest improvement was with the cd, dvd, md and vdp players. In total my system has improved considerably. There is serenity and improved coherence. Realize that these tweaks are reasonably cheap and simple. What have you got to loose?