Of the lower end RCBS kit that I bought, I don't use the loading block because I don't really use the powder measure the way it was intended. (I take the cap off of my powder measure, fill it, then crank some into the cap and just pour from there into my scale. I found that the measure just wasn't precise enough for my purposes - the 505 scale though, definitely is!) But that's just me. I have heard good things about the Charge Master, and I haven't been thrilled with the trimmer I bought (non-RCBS). At the same time, I really don't find myself trimming all that often either. So your call - big difference in price though. To me, I took that extra $$ and went after cleaning/separating equipment, calipers, shell boxes/labels, bullets - powder - and primers.
