I have the Yaqi Katana & Injector razors & DE razors which I occasionally use for my head /dome shaves. I find the pivoting head on the Gillette guard & other cartridge razors go over the contours on my head without fuss. I agree they don't give the same satisfaction of closeness that a DE or SE razor gives, but they work for me, and that's all that counts. If I had to just choose one type of razor for my head shaves it would be my injector razors, as they are very close in blade feel to Cartridge razors.