With just over 7,500 x 223 cases to prep for my AR's (and as many other rifle calibers combined), I opted for the RCBS Trim Mate and find it acceptable for the money, a bit slow (and in that I am certain that I am not ruining cases by being too aggressive), and significantly gentler on the hands than the old turn-them-one-by-one with the case deburring tool. I can prepare about 300-500 cases a night before my fingers are too tired and sore to continue. Take a week off and go for 500 again. In shorter time the Trim mate will achieve what the non-automated device is not able to achieve, which is why I bought the Mate in the first place.