Hi Marc,
I had to use it in earnest in 35 knots a few weeks ago when riding at Mullaloo in onshore winds. The kite luffed right in front of the surf club from around 12 o clock in very gusty winds and was looking to do a full power up in the middle of the power. I hit the trigger release about a nano second before the lines went tight and the bar and chicken loop sprung open and went flying up toward the kite.
It worked beautifully (thankfully) as I would been a dark smudge on the front of the club had it not opened properly. It was easy to find and activate as I only had a second to react.
This is why it is good to practice activating your safety quick release regularly so that in times like this one, when you are in need of instant escape, you react instinctively and quickly.
I usually check it and clean it before a launch in strong conditions by opening it and resetting it before launch just to be sure.
I rate it! If you dont fly Airush, you could easily look at a retrofit to your current bar as they are available as an individual item.
Good winds,