Anyone still enjoying these? I know I'm late to the party, but after eyeballing the Duke for a few years I finally scored a set a few months ago. I must say at first, they were very bright/etched sounding...I wasn't sure of them. Everything in this informative thread was helpful though and after some tweaking and testing, I have hit that wonderful sweet spot. The Opus #11 is the smoothest/best source I have and it is awesome with the Duke. I'm using Ostry OS100 tips. It took a bit to get used to the signature as my other IEMs are bass heavy and warmer. The BIE is great and I find it to pull more details than my MH1C, but once I began testing against the Duke, the Duke just sounded more natural than my other IEMs. The bass impact isn't as great, but the quality of the bass is phenomenal and fast and everything sounds *natural* - I hear delineation in drum fills and guitar tones are awesome. Perhaps it was psychoacoustic acclimation/brain burn-in combined with the right tips and insertion, but these have taken on a whole different character from when I first listened. I have never had my impressions change so much from an initial listen until reaching my current impressions. Maybe it's like what was mentioned in this thread about putting the work in to find the right source, fit, tips, etc - now that everything has clicked, I've never been closer to the music. These sound so realistic and natural. Analytical compared to other headphones in my collection, but very fun and engaging still. I love these.