I've been loading a lot recently and my elbow and shoulder were becoming sore. I decided to give the Inline Fabrication Ergo handle a try. This is the best Dillon upgrade available in my opinion. No more elbow and shoulder pain!
The Inline handle has great leverage reducing/eliminating fatigue. Seating primers has a much better feel also. I was using the Dillon roller handle too and regret not going with the Inline handle from the start.
I’ve got the inline roller ergo on one of my LNL AP presses. Agree with great ergonomics, smoother operation, better feel seating primers, etc. You can feel an about to be poorly seated primer before it even starts in the case.