The pioneer box is a waste of money. the +5 descended gear will get you to lvl 65. At level 65 you get Meister set. And from ATC Medals you get +7 75 Obsidian Honor for free from ATC Shop.
All these gear sets makes a LOT of the lower level gears obsolete. Only thing they are really used for nowadays is skins or Collector sets. Again tho, Pioneer box is a waste, you can't use it as a skin, or enchant it, or reinforce it.
tl;dr = Don't get Pioneer box.