+1 bro
I started out as a hardcore skeptic for everything that was "audiophile," but after hearing changes in everything, sometimes dramatic, sometimes subtle I've become a believer.
I sincerely believe that some engineer in the future will figure out a simple reason why there is burn-in, while doing some non-related research he will stumble upon it and be like "oh this is odd..."
*When I bought my 2nd Fiio X3, compared it next to my 4 month old X3 with like 300 hours on it. It was VERY different. Haha. even my friends who are not into this kind of stuff spotted it easily. The new one has bass bloat and sounded muffled.