The new Sanicon-Inna-Box sounds nice! I'm wondering if it is significantly quieter? That would be another huge plus.I did a quick search on that and found a video on the installation. It said the Sanicon-In-Box thingy needs to be mounted below the outlet of the tank. If Phoenix doesn't change the balance of the plumbing, this means SIB will be mounted in the same location as the current design, maybe hanging lower yet given the mechanical configuration. It will be interesting to see what the factory comes up with.
I agree the Sanicon runs loud. The older they are, the louder they are. Our new macerator is less loud. I think the worst of the noise comes from the rubber flappers inside the pump portion. I admit I tolerate the noise well. But I use it at dump stations, not at full hook-up campsites where the noise would be irritating to neighbors.
As with the fresh water pump, I think the noise resonates throughout the rig because of the "hard" connection. Having that soft 3" slinky connection as seen in the video, should dampen it well.
Our 2015 model 2551 (built in December 2014) had an "engineering prototype" of the new Turbo Sanicon installed. It's superb. And very quiet. It is hard to tell it is running once the tank is empty. It takes 45 seconds or so to empty the black water tank (30+ gallons) and about half that time to empty the grey water tank (20+ gallons). It is an excellent device and has given me zero problems and we had been out for about 2 1/2 months with our PC this year (over 12,000 milrs).