The examples are just that. Examples.
You would almost never use those in production, as you would usualy need to tweak some aspect of the shot, as well as optimize the fluid container, render modes, etc. to get it to render faster, look better, etc.
However, as a learning tool, and as a small stepping stone for your own effects, go for it
Israel "Izzy" Long
Motion and Title Design for Broadcast-Film-DS