Not strange – we like textbooks in the mix also. I own Runkles and have thumbed through Cultural Geography. Unfortunately, I can’t give you first hand experience as my oldest is just turning thirteen. Some good friends of ours (veteran homeschoolers with twelve children) use both and highly recommend them for high school. We plan to use both (barring some superior option between now and then).
Sorry, that’s not really much help.
Gaeleen