I had one installed in my aft
head last year. I love it so much I just got another one that I am in the process of installing in the foreword head. The aft one I got with the "sea fresh" option that allows switching between sea and fresh
water. That complicates
installation somewhat (vented loop, sea strainer and pump) but it's well worth it. Also, get the "smart panel". That's the flush switch panel that has four buttons. One button is a low
water flush option for liquid waste (the flush
pump only cycles once), the second button is normal flush for solids (flush
pump cycles three times), third puts water in the bowl and forth activates the flush pump to empty the bowl. The flush is quieter than the vacu flush on the last
boat, and MUCH quieter than the old
electric head it replaces. Very water efficient too. I highly recommend it.