I had been toying around upgrading to hydraulic brakes on my two RadRover's. Both bikes have about 3 thousand miles on them and the mechanical brakes have worked fine. Doing some research there is a ton of options so I decided to wait until this winter. Plans changed when my 2019 Rover's rear brake cable snapped, I was going to just replace the cable but it was not budging. I ended up going with CooMeng Zoom HB876E.
https://www.amazon.com/your-orders/pop?ref=ppx_yo2ov_dt_b_pop&orderId=111-4668659-8509040&lineItemId=qkrgmvnpnmqnwny&shipmentId=Xfgn4wjBv&packageId=1&asin=B0BC78WYVF
I found the install pretty easy considering the vague instructions.
I have ridden about 50 miles and very happy so far.