What "complications" are you expecting? It's pretty straight forward.
About the only downside is that if you leave something plugged in, it draws down the battery after you shut off the engine. That means that you need to be smart about what you leave plugged in and for how long to prevent a dead battery.
But I have never heard of it causing infection, mood swings, hair loss, anal leakage or any of the other common complications you hear about in the ads...
