I would not use this particular set up. Look at where the contact is? The the nose and side pieces are creeping up to the eye. The contact underneath has moved up the jowl. In order for this to be effective, the main unit (halter, headstall) must stay in place for consistent signals to the horse.
Well, I've been using it with her for 2.5 years, and she seems pretty happy. Mostly I can turn her by just removing some slack from the rein. If she pushes her head into it, it creeps up, but she still handles left, right, stop, go just fine. I'm not interested in getting a particular headset, etc.
If need be, I can do one rein stops and pulley stops with it.
The cross-under types I tried didn't release pressure when I released the rein, so I don't use them. There are other types of bitless bridles, but some of them are scary.
If the horse is willing to obey you, you need very little to send a signal. If the horse gets more excited or scared, you need to send a stronger (harsher?) signal to break thru the background noise of their fear or tension. There are situations where a bit is more appropriate than bitless, but most general putzing around can be done with the bridle/halter I'm using.
But no one has to use it. It is an option, it is fairly cheap, lasts long and works fine as a halter too. I use a snaffle on my gelding instead, because he seems happier with a bit.
If you look at my "barn", you can see the horses ridden in a more typical fashion. I posted the picture I did because it is the only one I have close up.