I'm looking for a new charger. I think I've settled on the XP4, but just thought I'd look for some opinions on it. Is Xtar a good brand? Is the XP4 as good as it looks on paper? From what I've read so far it seems xtar is a little higher quality than the Nitecore I4 or Efest LUC4. I get a little paranoid about batteries and chargers and just want to make sure I'm getting a top-quality device.