The non-stick foot was useful for vinyl and water-proof fabric.

I am on the side of thinking this is a scam. I use my walking/even feed foot for most of my piecing. I rarely have ends that don't match. I'll spend my $100 on fabric and use my machines metal feet that people have been using for centuries.

I have noticed in a lot of youtube sewing videos, the shorts with no talking, the machines have a red foot. I have always wondered about those red feet.

The Google shows several options. This is one
https://www.sewingpartsonline.com/pr...SABEgIMy_D_BwE

Feet
 

Too much. Might consider when they are $15... ha, that won't happen....? I have the glide foot for vinyl,,that's all I need.

The price doesn't bother me if the value it there. I think when sets are sent to quilt influencers and they start reviewing them then the feet could be the best thing to have or just pretty red feet.