I really like the competition seating dies from both Redding and Forster. They come with or without the micrometer adjustment and seat bullets the same, but the mic adjustment does make it quite a bit easier changing seating depths.
The comp dies have a sliding sleave that the case is raised and secured into first. After this, the sleeve and case are raised further, as one unit, seating the bullet. It's believed that this system keeps everything in much better alignment as the bullet is being seated. I have two Redding Mic's, and one Forster Mic. Both are good systems.