Yes, they work. They will help prevent nerve damage to the hands and lessen the pain if the hands are arthritic.
I used them in the past at work when sanding/painting aircraft, but that was an extreme case. Pneumatic DA sanders, with about 40% overhead and 20% vertical surfaces, so we had to supply all the pressure without gravity assist. During the prep phase, we would be actively sanding for 6 hours of an eight hour shift. I would go through a pair about every three months.
Ours were supplied by the employer, so I do not recall the brand. I used the ones without the finger tips covered as it made it easier to peel off the worn disks, but 20 years later, I have developed some numbness and pain in my fingertips that I can't otherwise account for. As I said, mine was extreme usage over an eight year period.