We walked here from staying at beach republic... we went in August on a sunny day. Lovely sand and warm clear sea. It does get deeper further out, but was perfect for my family (children 13,12. & 8). Not much shade and the icecream at the local restaurant the most expensive I have ever bought, however we did see fish swimming between our toes, and my boys spent all day snorkelling.
Probably not amazing if you are a pro snorkeller but perfect to keep children and husband occupied. My elder daughter and I went for a massage. A good day out and in walking distance for us at the time, not sure if I would travel far just for this beach, as I am sure there are others on koh samui which are the same.