Although apparently not too popular, I like the ABS side splitters from MAGG.
I picked them because they match my ABS rock guards, and until I saw the earlier post about EOS, they were one of few cheap options.
I like the grassroots racing look and they appear to stick out a little further than the sculpted OEM style
They do not do as much to block rocks as the rock guards do.
Mine are rigidly attached with machine screws, washers, and nuts. Survived several cones and high speed road course work.