I ordered this pair of brushes to use on my Valter Blakbox 5, and I wasn't disappointed.
Besides offering a nice compliment for playing with your hands (it kind of hurts after a while...) these brushes will give you a nice, jazzy sound on your cajon as well as "regular drums". They work great with the hand cymbals I use as well.
However, seeing as they are extremely "light" I'd suggest that you use a cajon pedal if you don't want your bass to suffer. The snare sounds great, but the bass gets a bit washed out...
I'd recommend this product to any percussionist out there!