Need some help. Am interested in buying a Lyman Model 55 powder measure for my reloading chores. Previously used a Lee Auto Disk, so am only familiar with the Lee concept of removable disks with different size charge holes. The ad for the Lyman mentions "micrometer adjustable slides". What are they? Actually, I don't need to know what they are as much as I would like to know if anyone has experience with the Lyman 55, and what do you think of it? Does is compare favorably to the more expensive variety (RCBS, Redding)? Thanks - Fred