I'm not afraid of viruses or any of that nonsense, I just dont want to have compatibility issues when playing games and later get blamed that I'm not sticking to what everyone else uses which I assume would be the official build. I know no software is ever perfect, I just like sticking with what works.Loadiine nightly will NOT harm your Wii U
There is no risk to use one nightly.
And if there is a problem, just go back to your previous version