I use the Automec stuff from Bull Motif. Works fine. Harder to bleed though & expensive (£25 a litre bottle).
All the brake system was replaced new before I added it though....
Never had any trouble with Automec either.
However, I've found it pays to give the system a bit of a flush through annually. Any crud remaining in the system seems to find it's way to the bleed nipples so opening each in turn with pressure behind seems to produce said crud with fluid in a jar every time. In fact the first time I did this, after two years untouched, one of the rear bleed nipples was blocked and had to be cleared first.