Guinevere Sanding System

Happy New Year to all!

Does anyone have experience using the Guinevere Sanding System? King Arthur's Tools - Guinevere Total Sanding System - Guinevere & Accessories - Sanding & Polishing Sets (katools.com)

I have been getting lots of requests for large maple carving boards with juice grooves. I use a core box bit to make the groove and I find it impossible to route the corners without at least a small amount of burning. Sanding the corners is slow and wears out my hands. The sanding system looks like it might be a good solution but I have never used one.

As usual, thanks for all of the great advise.