I tried the head blade today, I broke out like crazy in the back around my neck. Freaked out bc it looked and felt horrible, used some Benadryl cream which quickly took away the itching, burning, and red bumps.
Good news is work went well. Def got some looks at first, but mostly positive comments. I think I'll stick to the Mach 3 and going with the grain for a bit to let my scalp adjust. Anyways I'm feeling really good about the decision to go sly. Thanks everyone!