Optics and sound, I feel like most other reviewers as really good. What bothers me personally is that the speaker does not remember the last set volume operation. Each time such a loud sound is heard, that you tremble all around, if you have the equipment rewards. You have to adjust the volume down, also because of the reproduced sound from the connected device with the exact same volume comes so soon as possible. The flashing blue LED for Blutooth connection I find rather annoying. Personally, I would prefer an integrated light. My Windows Media Player (Windows 8.1 Pro, 64-bit) crashes in connection with the CSL-Speaker from time to time.
