Depends upon the location and amount of light, I think. I don't use one. Normally I can pull just about anything out in my plug unless it is over about 6". I hunt at night a lot and it is necessary to get it right the first time. Sports fields and public parks are easy. I don't hunt the woods at night. In the daylight, in wooded areas, I cut my area as best as possible, roots ya know, and set my machine down next to me, scan a handfull of loose soil and set it down in a separate pile next to the hole. Wooded area searches are the only places I think I would use one if I would at all. Most of the time I take a small 12" x 12" plastic mat with me so any of my plug "droppings" will not get into the grass and so neither will my target.
Basically it is up to you whether or not you have a difficult time as a beginner. With practice you may not need one. Maybe you will just WANT it. Go for it if it makes ya happy. GL
Laater...