I recently bought the Head-Mate for replacing my older one.
Cannot say I was happy with it.
1) Lots of improperly tensioned screws in the brand new unit right out of the box. Ended up re-torquing every fastener on the thing.
2) Old head was very hard to pump and brand new unit is not that much better (hoses replaced at install time). I've done plenty of cooking oil treatments but its the same.
3) Getting water leaks around pump assembly seams already (~1 year old)
4) The seat isnt nearly as sturdy as the previous unit. Its like the hinge material is a very soft plastic. Twice now I've had female crew twist the seat right off the hinges while sailing in big waves.
Female crew dont like that kinda thing, I've learned.