HiPP or Holle Has anyone ever used these formulas? I know they're not popular in the US but I heard…

HiPP or Holle

Has anyone ever used these formulas? I know they're not popular in the US but I heard about them and I've been looking them up. They really don't seem super expensive, I would just hate they are not available in stores. He's currently on Similac pro-sensitive and does just fine. I just want the absolute best for him if he isn't getting breast milk.