*disclaimer - I work in a biomechanics lab that sells orthotics.
Any time you use an external device like these to compensate for a musculoskeletal problem it’s a tricky thing. Should you use them all the time? Just when lifting? Can you “fix” the problem and just use the orthotics as a band-aid until then?
They’re the perfect choice when the problem is a structural abnormality; as an example, my right tibia is formed so that it externally rotates about 20 degrees more than my left (which is the normal one). For me, correcting the problems that can cause at the foot and ankle help considerably. They’re also great if one leg is longer than the other, for instance.
Beyond that, it gets a little muddier. Your best bet is to get evaluated by a physical therapist with a fair bit of experience with athletes or a specialist, such as a clinical biomechanist. Sometimes the answer is as simple as correcting a muscle imbalance and orthotics would be a waste and just mask the problem. Other times it’s not.
Good footwear always helps, though. For instance, doing strongman stuff in Chucks is a bad idea.
Side note, the total cost for a set was over $1000?!? That’s fucking ridiculous. We use a company called eSoles that charges less than half that for a product that’s better than most others. I don’t see any kickback from them, this is just from personal experience. I’ve dealt with about 4 different makers, and they’re by far the best service, product, and price. Don’t know if they’re up in Wales yet though.
Have a good one,