I use Nokia Health Mate since I have the line of Withings (now Nokia) devices. The Watch app shows weight, steps and blood pressure but I guess this is read from Health Mate and not Apple health. It is written to Apple health after I do a measurement though..
It doesn't have complications and it's slow so I never bother using it. I don't think it has been updated for watchOS 3 yet either since it mentions Glances somewhere and that isn't in watchOS anymore.