Andromalia
Pardon my french
Does "power surges or sags" appear in for example European countries?
That is dependant upon both the general elctric network and your home cables. If the elecrtic stuff hasn't been redone in your house in 50 years...^^
After that I suppose it depends which country you live in, I haven't had any broad power issues in western europe that I can remember. But if you're a touring musician, better safe than sorry, as you likely won't be able just to grab another axe fx to finish your tour as you could any amp head on the market.