I like OB air cleaners, simple and effective. Also much cheaper.
I don't buy any of those published "X% better air flow with my paper filter" by people selling paper filters.
They are still used in desert areas. Ive been reading and in the middle east, India, etc., it sounds quite common they install OB filters, paper just cannot deal with the volume of dust. I also havnt seen any increase in general range of overhaul times on Mercedes after they switched. They went 1/2 a million miles with OB filters, they still do with paper, cant be the filter.