I've recently bought the artificial leather version of this strap. It doesn't have the adjustments of the premium version - the cord doesn't unhook from the top holes and there isn't a lock hook for the adjuster. However, after over an hour's fettling I managed to get it adjusted for alto and tenor around my thin neck, sloping shoulders and bony clavicles. I've just finished a two hour practise session and it worked a treat.
I've found the way to get the length right is to loosen the knots at the top of the front adjuster cord and shorten/lengthen the cord so that the adjuster is almost at the bottom when your largest saxophone is attached. Be sure to tighten the knots again before attaching a saxophone! This means that when a shorter saxophone is attached the adjuster doesn't need to be pulled so far towards your neck.
For the width, it was a combination of adjusting the length of the cord at the back and threading the cord through the butterfly adjuster until the straps could pass either side of the neck without rubbing against it.
The shaping of the covered aluminium straps is a matter of bending them in the right place by the right amount, and in the right direction. After some trial and error, I found it best to start at the back and work forwards, making sure that the straps are in contact with your body behind and on top of your shoulders. After this, they can come forward over the clavicle bones so that you can see air between the strap and body, then bent back towards the body at the ends so that they contact your chest. Once one side is the correct shape, it can be used as a template for the second. It's good exercise for the thumbs.
I now have a tailor fitted strap that keeps the weight of the saxophone off my neck. And I have sore thumbs.