I recently invested in a Lyman Power Trimmer. Great machine and I have trimmed maybe 200-300 cases. I have small problem though. The trimmed mouth of the case is a bit rougher than my Forrester manual trimmer, requiring a bit more deburring. The manufacturer recommends a carbide cutter, which sells for about $45-$50. I have heard they work so well that it eliminates a lot of deburring/chamfering, but would like to hear from you guys out there before I plunk down another $50.