Had this for 30 odd dives now. Haven't had to use it in anger as an Occy in any emergencies, but done extended periods breathing through it, and it's as good as a standard reg. Inflation controls are smooth and accurate, easy to find in the murk. Less gear to carry, and losing the dangle tangle of an Occy and retainer is brilliant - much neater rig. Wouldn't go back to a separate Occy. Recommended.