Two words, case feeder. You can resize and trim at the same station. I don't have the dillon trimmer but resized about 500 ish brass this afternoon and was working on trimming them (on my giruard trimmer). It would have been nice to just watch them move down the line after getting trimmed by the 1200. Faster and more efficient. Don't get me wrong the giruard trimmer is nice, but the Dillon on a 650 makes for less work, two steps combined into one. I have actually thought about selling mine and getting the Dillon 1200.