The deHavilland Mercury has given me 7 months of musical pleasure adding more realism and even less listening fatigue to an already excellent system. It is extremely natural sounding. I had the Pass 2.5 before the Mercury. I would rate the Pass 9/10 and Mercury 9.5/10. I think it is a very good value for the money. I have found out many times you have to listen for yourself. Artg was disappointed, but after 40 years of being an audiophile I recommend giving the Mercury a try.