The U-Free are really good earbuds. They have a clean, neutral sound with no bass “processing” like many top-of-the-line TWs. In particular, the bass is dry and clean. Last but not least, the volume is really very high. Definitely the best TW's I've ever had!!!
P. S. An honorable mention should also be made to Mr. Andrew from Musicteck assistance, very kind and competent.
Paolo Cermelli