I'm doing some hard math on something faster than my 550 since I'm shooting more now. Happily, the 550 is infinitely flexible and decently fast. I just need to prestage supplies ahead of time and make time to reload more. However, knocking out 100 rounds of 9mm in way less than 10 mins is very tempting (it takes me about 12-14 minutes per 100 on the 550).
All of my LnL research shows a trend in LnL users saying that the LnL does not stay set where you want and needs readjusting way more often than Dillons. There is also a trend in folks reporting high primer seating issues.