I will add that for the guys with a full head of hair that like the look of a shaved head, it's ok to take it all off. Yes, some people won't understand your decision, but it's just another haircut choice.
Over five years ago, I wanted to see what it was like to have a short buzzcut. I was at a city carnival and noticed at least a dozen guys with shaved heads, including my neighbor. So I convinced my then girlfriend to agree to me getting a one time buzzcut. So I got up early the next morning and gave myself a buzzcut. I hated it, so went shorter, and then a no guard clipper shave. Then I figured I might as well shave it one time.
When the s/o got up and saw me bald as a cueball, she was shocked. A few hours later, she said she loved it, and I should keep it shaved for awhile.
So even if your not balding, but want to try a smooth bald head, give it a shot!