I run the chargemaster, and I have only done about 2000 rounds. 7 .62x54, .308, .303 Brit, etc and I have only had it throw 2 charges that were slightly over or under my desired charge. I don't have any personal experience with the Lyman DPS, but I do have a good friend who uses it and he is really frustrated with it consistently throwing a slight over/undercharge. I say you can't go wrong with RCBS. Everytime I had to deal with their customer service they took really good care of me. (never had a problem with the chargemaster though)
Hope that helped.
Cheers,
- Mac