I often ride in Enduro style boots, like TCX Pro 2.1. This gives me much needed protection, but it leaves scars on bikes. Since my 1090 is brand new, protecting nice orange trellis frame seemed like a good idea.
Guards are made from high quality plastic and fit is great. Each guard is secured using three zip ties.
I like that guards are not sticking out too much, visually. Since fit is good, they seem like OEM part. Generally, I don't like adding too much "protection" to the bike, but I am sure that this nice orange frame would be ruined very soon. Scratches will be much less visible on black plastic.
Folks on FB warned me that there is a chance that guards themselves will harm the frame. So I removed frame guards after some 500 km of mixed road-off road riding. Frame was not scratched, but some markings were visible.
So I did as suggested, I applied EPDM self-adhesive rubber strips on the frame and reinstalled the guards.