I have to say I'm extremely impressed with this little product. It's completely transformed the performance of two of my portable amps with low impedance IEMs - it basically does exactly what it's supposed to do. I was hopeful that it would do the trick with my Fostex HP-V1 hybrid tube amp and it duly did, banishing background hiss almost completely with my Westone W60s and Noble Kaiser Encores. What I didn't expect was the impact on my solid state Oppo HA2, which I'd actually planned to sell. Instead, my impression of this amp is completely changed and, combined with the iEMatch and the Nobles, its simply become a world beater. I've been using a Questyle QP1R as the source and I actually prefer the sound through the Oppo to the built in amp - it really is that good. Without the iEMatch I find the Oppo almost unusable with sensitive IEMs but whatever the weird aural alchemy going on inside ifi's little gadget, it's created a truly amazing synergy with the Oppo, particularly on the high gain setting. I can only urge you to try it.