Hi shubox56,
As you’re probably aware, CozyPure is a site member here, and I think highly of the advice they provide and their products. I’m sure they’ll be able to answer your questions. Cheryl Hahn, the owner of CozyPure, talks about the LaNoodle topper in this video, which I think is informative as well.
In case you haven’t already seen it, there’s more detail about featherbeds in this post. Featherbeds can be any combination of feathers and down, and depending upon the fill power, fill weight, and feather/down ratio, the comfort of the topper can be varied. This can add a small amount of extra surface plushness, and indeed you would want to “fluff up” the product frequently, and even rehydrate the down over time.
Phoenix