Works Great!. I use with suction cup protectors to protect finish.
It has resolved my slipping problem, but.
The fact that you have to take it off each time you play and stick it back to a plastified included cardboard is a bit of a turn off, but it works.
The wrap around lower piece is even weirder with 4 plastic sticker an velcro attachments for the non-slip surface.
Probably won't be using that one much or not at all.
Conclusion: So, for me, using one piece of 2 3/4" x 4 3/4" non-slip for 18.$ US plus 11.$ US shipping makes this product pretty expensive for what it is.
Perfect non-intrusive protection for your guitar that helps stabilize it.