One of the adoption counselors at ARF recommends them a lot. We even sell them in the store. I would think the hardest part would be to get them on! But I guess you could take them to the vet or groomer to have them put them on for you if you can't do it. Obviously, you didn't have a problem getting them on Kyubey, so that's great!
I might consider them for Jax. He is a scratcher too! He scratches on Bruce's music equipment and we've used the sticky sheets which work well too.

I think we need to see pictures of Kyubey with his new nails.