I have been using Insight Timer for a few years now. I have listened to quite a few guided meditations over that time. I am on day 23of Sam's guided meditation and really appreciate the way he can drill down to the essence of being just an observer. "Just experience the raw data" without trying to understand or process or label. I have found that even though I have a few years under my belt his lessons and guided meditations are still immensely valuable and have helped me go further in my practice.