Dissipation... just dissipate yourself

[Riyshn]

any scenario where you are not left in a worst position after using it?

Well...

Any time you don't need much more than regens for the next 30sec.
Any time you really need more single target healing from the healing boost.
Any time you want to be able to use 9 Aetherflow stacks in less than a minute.
When you die immediately after using Aetherflow, to get fast stacks to help recover.

So it is occasionally useful, yes.