Summary: I could hear things okay as long as I was right next to the speakers. I needed speakers that I could hear from across the room. I've been told since then that USB models won't provide much power or volume.
Summary: Good sound for the size, but Astak sounds better. Electronics inside Logitech S150 is good enough for a better sound. I recommend disassemble speakers, and use electronic boards with larger speakers. Automotive 50Hz-18KHz speakers will work fine. You will have higher power, and better quality.