At first I thought the B-Grip system seemed a bit pricey, but when the B-Grip belt and holster game, I knew right away it was a quality product and if you have only used the neck strap then your in for a surprise.
Once I got the belt adjusted and in a comfortable height, then I experimented with how much to the side or more to the front for the holster, unlike the model in the picture, most of my photography is done while I am in a wheel cheer so my experience will be a bit unique.
As the strap is 50mm wide this made it comfortable to wear for a long time, also the holster has a good length and is varly wide so spreads the weight of the camera, I do really like the plate that fits to the camera base, it is very sturdy and gives confidence and locks tightly into the holster, placing the set up into the holster needs practice to get fast has you need the plate to be square on to the retaining mate on the holster, releasing is easier and quicker so you are unlikely to miss that shot, I have not tried my 300mm lens in the holster yet, and as I am sitting it may not be practical for me, so in the meantime my second camera is still on the neck strap.
The Pros;
Cameras are stable and well protected as long as you don't walk into anything
Takes the weight of your neck and cameras don't swing
You have hands free
Their is a security latch that stops the camera being released from the holster
Plastic parts are ABS
Cons;
Its not a cheap system
You are best do buy the Tripod adapter which ups the overall cost
In conclusion it is one of the better on body camera systems (I have tried others), made of very tuf durable materials, and comfortable to wear, it takes a few outings to get used to it, but it won me over.