This is a good thing to use and work with as it teaches you to change your moves and work more efficiently with less energy.
Not so much needed in bigger wood or on bigger saws (55cc +).
In smaller stuff as second and third thinning in spruce it is a real big help to learn how to work more effective and with less energy. Safety aspect is not more than it has been on the other versions and function is the same.
Production and speed actually increase and less fatigue. Make more money and be less tired....
Work right it is not in the way or activated, just as the normal chain break. It is the only system I have seen that actually work when limbing the branches under tree when saw is on its side and were there is high risk of missing something when looking.
In the production and logging we have here it is a good thing. For those that do thinning it is a great help to learn and stay on track.
Chain break should be engaged when transporting saw or saw stopped!
Safety here is pretty tuff and the amount of injury's in professional work pretty low.
I think it can seem stupid, Especially to those that has not tried it. I run the older system a bit and tried this new. I learned a lot in just a couple hrs running with a good instructor. Small things corrected that not only helped increase productivity, but also safety and strain on saw.
Most of us are in this for money, I was too, so that was reason enough for me.