We installed the system in the Marex 375 because the path of the "fresh water" to the toilet is very long at approx. 2 m and therefore an unpleasant smell had always set in after a certain absence from board. The system was easy to install (20 min) and has worked perfectly (three weeks) and does what it says on the tin.
I fitted 2 of these units to electric flushing offshore toilets, one worked perfectly the other has been replaced twice due to leakage and poor pump quality. It's a shame because the system is great when it works its perfect but its very fragile.