The holidays are coming up and I plan to purchase my mom and two siblings tablets. I'm deciding between the iPad Mini, Kindle Fire HD, and Nexus 7. It really comes down to user-friendliness. I know iOS is probably the best in the market in this regard but I'm not sure if it warrants a $129 premium for each Mini. Anyone here have parents/kids that use a Kindle or Nexus? How do they fare against iOS for less "techie" people?