This was bought via Amazon and was an upgrade from the Sabre U2 DAC which in itself was excellent. The 9018 raises the bar for a low cost high quality DAC. The improvement in quality straight out of the box was striking. Run in time has not really made that much difference. This sounds excellent immediately. Deep Bass, sparking Mids and clear Highs are very obvious. One thing I've noticed is a big improvement in PLII surround sound. As I watch a number of programmes and some films I've noticed an increase in surround effects and room acoustics. I find myself listening to old music afresh, hearing things I've not noticed before. This is the best low cost DAC on the market.