personally i love them, you wont believe how quiet the hookah is with them, it really separates the bubbles filtering the smoke and drawing more of it.
Like i said if you have ever tried a solid milk base without a diffuser you will notice that the milk bubbles up too fast, and could draw into the hose. This would never happen with the diffuser, I love it
Shisa flavors, and brands are subjective to individuals. But proper setup and hookah care is not.