Ron, I guess we just have different perspectives and definition of being a slave. I don't want to be a slave to MSD's either - that's why I'm willing to walk down the dock to keep the system low-maintenance. After 12 years, the hoses are original and odorless, and the aft head is working perfectly with the factory-installed duckbills! The other head on the other hand, well let's just say that I've learned the hard way not to skip the awkward head lessons when guests are aboard...
Water: yes, it's key. Not only fresh water, but LOTS of it. I said in my first post that I have the luxury of being able to send a lot of water through the system. That's part one. Part two is to not keep it in the tank very long! I fully understand that not everyone has this luxury. I've seen boats with woefully undersized tanks, and boating environments with few and far between pump-out options.
If my options were more restricted, I would accept a more intensive/expensive approach. In the meantime, I appreciate having such a low-maintenance, low cost, no-odor system, and I'm glad I knew better than to believe the dock and forum talk which suggests otherwise.