As i mentioned i use both hands but i find that the "offhand" (for me the right) shave a little closer and better than the dominant hand mainly because i take more care to make sure the angles are right because i do not really "trust" the right hand... BTW I've used a straight for around 30 years and shaving is automatic and does not really require a mirror anymore, for which i am thankful because my hideous aged appearance break common glass mirrors