My favorite bar.
The weight is higher on your shoulders and there is a small camber, so you're constantly driving your head back into the bar to keep the weight from coming over top of your head. It will strengthen your upper back and traps so that when you switch to a straight bar squat, you'll be able to keep your upper back upright.
The first time I ever used the SSB was for good mornings and the next day my entire back was on fire. My traps were on fire from my head pushing back against the bar and my lower back was on fire because I could use heavier weight on a GM exercise than I was used to because I didn't have to worry about the bar rolling around on my back.
I almost exclusively use it for dynamic effort squats because it forces me to drive with my head out of the hole or else I'm going to good morning the weight.
If you are in the sport for long you will also probably develop some kind of bicep tendon problems and the SSB gives your elbows / biceps a break.