A lot of the people I've talked to or heard about claim that IKEA batteries are much less reliable than the major battery brands, but there isn't an overwhelming consensus. Some claim their IKEA batteries only lasted half as long as Duracel or Energizer, but that's probably a little exaggerated. Even if it's true, though, it's still a good deal (depending on what you're using the batteries for), considering they normally cost well under half as much as the name brands.