Originally I wanted to return it because the Windows 7 driver for the USB interface was missing. Topping said this is a very common problem and there is no way to fix it. I knew it wasn't true. However, the seller offered a discount if I liked the sound and kept it. After 2 weeks I decided to go for the sound not the discount. The sound is rich, distinct, bright, etc. Paired with the Airpulse A200, it sounds like a Grado PS1000 that I've owned for years. Only more powerful and more comfortable (because I don't wear it). Get it, you won't regret it. Incidentally, Topping has released a driver for Windows 7's USB interface. It works out.
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