I believe the biggest difference between the most expensive and least expensive single stage press is only in over all finish. Seem's other than that every one of them have the group of people that love and/or hate them! I started with an RCBS Jr many years ago and bought into the spend more get more mentality so stepped up to a Rockchucker. Nothing about my ammo changed. Of course I suppose if you were going to be doing heavy case forming, it might make a difference. On my Jr years ago I made a lot of 243 cases from 308 case's in one operation. Same with 25-06 cases from 30-06 case's. I'm not sure what heavy sizing means! About Lee press's I hear as much good as bad and it's Lee that get's the most negative responses, seem's they are simply to inexpensive to be good press's but somehow for many they work well for years! I like my RCBS tools! I could live with any other including Lee!