Query re dynamic arm supports etc

Hi My wife has 2ndry progressive. Her one ‘good’ arm is now deciding to play up…difficulty raising arm at shoulder or lifting hand to mouth. Anyone had any experience of or knowledge of dynamic arm supports e.g Armon brand? They’re not cheap and we don’t want to waste money, but if they can help e.g to allow her to eat without assistance we might consider. Any thoughts gratefully reveived. Thanks.