I do find this ruler grips a bit better than my omnigrip ones, though it does still slip a bit. I think it's less tiring for my hands because I'm not pushing as hard.
The ruler is exactly what I need for trimming my blocks. I also bought a Sew Hot Iron Rest specifically to use with my small iron and pressing board. It allows me to press as I go without having to set up my larger ironing board. Works exactly as I thought it would....