No issues noted with flows/pressures, post new membrane setup, though the last few we have fitted have not resulted in the same improvement in permeate conductivity that we have been used to. It used to be we would see single figures but now mid teens post new membrane. Not a huge difference but a difference. Not related to incoming water quality as we run 10 in one unit for comparison.
We seem to have had a few recently that have failed after about 6 months.
rejection rate down at 50 or less, this in from feed water with a conductivity of about 100 and softer than a fluffy thing after a wash with some comfort