The only drawback to the Lyman 55 is the sliders that are used to change the powder charge. it's hard, at least for me, to move the sliders for a small one or two grain weight change. If you are going to use it for a single charge of some particular powder, tinker with the sliders until you get the charge you want. Then just use it.
All the others, RCBS, Redding, etc., have micrometer screw weight adjustments that are a lot easier and quicker to use.