I have been using Ensemble products for about a year now, and YES they take 100 hrs or more to break in! I thought they sounded very good when I first got them, but after about 6 weeks, and after 3 months in the case of the Isolink power transformer I bought to plug my CD player into, they really came to life. The details and dynamics are unmatched by anything I've heard in my system, but I have not come close to the Valhallas. I was using Transparent Reference interconnects and speaker cables before the Ensemble. I have now replaced all the Transparent with Dynaflux and Masterflux, and am ordering a pair of their speaker cables (called the Megaflux) as well. Plus I have bought as many of their power cords as I can for all of my components. Anyway, for your comparison purposes, I hope you can keep the Ensembles for a few weeks so they have a chance to burn in. If you think they sound as good as the Valhallas, you will have saved yourself a BUNDLE. Keep us posted on your results.
Sarah
Sarah