The earbuds' casing is made of hard plastic, making them very uncomfortable to wear. The sound is tinny and may be suitable for speech, but even then there is a complete lack of midrange and bass.
The much-advertised feature “no pressure sensation” is absolutely not true!
1. Due to the smooth surface, you have to literally press the earbud into your ear so that it doesn't fall out, and
2. When lying on your side (head with ear on the pillow), the hard plastic presses painfully against the ear.