Ive not used a monopod, but for me a tripod when doing insect macro shots is next to useless (unless the insect is dead/dying/asleep). I tend to use MF and handhold all my shots. However, I wouldn't mind trying to use a monopod it it was easy and quick enough to adjust. Ive heard of one where you put your foot on a bit at the bottom of the monopod, then squeeze a lever and adjust its height. If this works how I imagine it in my head, I could see it being quite good and flexible enough for macro work.