There are very few true two-stage triggers on air rifles. The Weihrauch trigger on the HW100 is an example, and a very good trigger. Most others are made to feel like two stages, because some shooters prefer it. The unique advantage in a real two-stage trigger is the the safety offered by the utilization of two sears. The second stage sear doesn't move to its final release position until the first stage movement is fully taken up, a real advantage in military applications. It's purely personal preference, but I generally prefer single stage triggers. Regardless, the key is understanding how your trigger works. Most of them should never be assumed safe because the safety is engaged.