Reviews are great, just seem fiddly to set up?
https://www.cyclingweekly.com/reviews/brakes/hope-rx4-road-disc-caliper
https://www.cyclingweekly.com/reviews/brakes/hope-rx4-road-disc-caliper
My RX4 brakes were the first hydraulic brakes I have set up from scratch.Front was easy but the rear with internal brake line was a nightmare,took five attempts before I was there.I ended up with bike suspended vertically and the calliper dangling off the bike hanging down.Best tip is to watch the Hope video and follow it precisely.Reviews are great, just seem fiddly to set up?
https://www.cyclingweekly.com/reviews/brakes/hope-rx4-road-disc-caliper
Hope and Sram use dot5.1. shimano and magura use mineral oil.