Been using a full face mask for about a month. Had 8 ahi/hr before starting, which dropped down to an average of 2/hr with a full face mask. Switched to a nasal mask 3 days ago. My ahi went down to 0.5/hr average. Leak went from 30l/min to 0-5l/min.
Do have some comfort issues still with the headgear but it’s still much better than the full face. My full face was the F20 and I went to the Mirage.