Been using a 900 since about the time they came out…cannot speak to the RCBS as I came from a Hornady 366 and the difference was night and day. Wish I would have taken a picture before I started loading…anyway started with three Rubbermaid containers, one 20-30 gallon full of 12ga hulls, one 10-15-20 gallon full of 20ga hulls and one same size with 28ga hulls. Started Friday evening and will finish all hulls sometime this week…probably Wednesday, approx. 10k total give or take. Couple things I don’t like about it…it only likes to load one hull type at a time…AA, STS, Gun Club, etc., if you mix hulls it can cause issues…split or crushed hulls, spilled shot, doesn’t happen often but when it does it normally starts a chain reaction…you’ll get couple dozen; so I only load AA’s. Another issue; doesn’t hold enough powder…just under 1lb, also the hull feeder has a small capacity as well, maybe 200 hulls and I’m really pushing that number. The capacity issues are mainly how I load…I load a couple times a year everything I have, so having to stop to put more powder or hulls in gets old after about the 6th time. I can purchase an extended powder reservoir, but that only doubles the capacity and for me that isn’t enough…4-5 lbs. would be ideal, again for me and how I load. The feeder issue can be “fixed” by adding additional height to the rear and back of the “bowl”, I just haven’t gotten around to doing it, as every time I think about doing it I’m just starting to load. Other than those issues it’s a great machine…again these are issues for me as I load EVERY empty hull I have at one time over a couple days. If one were to load a couple hundred at a time I cannot see any issues…powder lasts about 200 hulls and the hopper holds close to that number.