I used Calm for about a year via a free one year subscription through my HMO. I use it primarily for the sleep stories, which I find very soothing depending on the narrator. They could update the content more frequently and work with some of the narrators on improving their delivery. A few voices are a bit less soothing and some simply read too fast.As for the meditations, I think they are good for beginners but experienced practitioners will find the content to be limited. Also, they would do well to have more variety for instructors. I find Tamara Levitt's voice to be distracting and her delivery can be a bit condescending, just my experience. I particularly like Shinzen Young, but unfortunately he only has one meditation on Calm. Calm would improve greatly if they listened to the feedback about improving the content to have more for experienced meditators and have more content by teachers/instructors that people like. I'm Ms. Levitt is a nice person and knows about meditation but her voice and style are not helpful.