Had my first trial of Bender Fender and Butt Fender last night.
Not bad at all for something so small and light. Nowhere near as good protection as my usual THE front moto-x style fender and old-skool Crud-guard on the back, but as subtle and light alternative I was impressed.
What gets me is that the protection is a reversal from my usual. Nomally, the rear wheel has close coverage (which keeps the dropper seatpost clean) and the front has loads of clearance by mounting in the crown. This is the other way round with tight clearance at the front and acres of clearance at tge back.
What would be really good would be a Bender-Fender style 'guard to go on the back. If nothing else, they look better being tighter to the wheel as they're less obvious.