Yes, I'm looking forward to a head without a smell. The smell was never very strong, but enough to be bothersome. I did clean all those compartments with bleach and then Odoban. The smell under the V-bunk is completely gone - I think the pump was the culprit. The old rubber membrane had this whitish coating on it that I think was caused by the glycol. I replaced the pump with the Whale-Henderson pump that's fully enclosed, and will keep the old pump with a new nitrile membrane as a backup. Once I install the Y-valve, I'll know about the other compartment, but I'm hopeful.I think that you'll be glad that you made the change. It's so much nicer to open up the boat and not smell or have to apologize to a guest for the 'boat smell.' Make sure that you use some sort of bleach or disinfectant (I used Odoban) and wipe down all the interior spaces under the sink and the vee-bunk. Mine were pretty saturated with odor.
One other think you might consider, while you're at it. I didn't have any way of knowing whether the holding tank was full. I installed a clear, 4" inspection port in the lid of the tank. Seal it VERY well though.
I'm not sure if I'm ready to install an inspection port - when I removed the old hose to the holding tank, the smell was pretty acrid. Not sure what it would smell like if I opened up a big hole in the top. How did you seal the port?