World of Warcraft (Wow) Legion Reputations includes:

• Part of "Broken Isles Pathfinder, Part One" for increased mount speed (will be requested for Broken Isles Pathfinder, Part Two to be able to fly).
• Unlocks Suramar dungeons.
• Receipts for professions, toys, epic items of a maximal pre-raid level. 
• At Friendly rep with all Broken Isles, you receive a quest that rewards Flight Master's Whistle which transports you to the nearest flight master and is a huge help while leveling/questing.
• Friends in a Broken Land / Broken Isles Diplomat achievements, depending on your order.

World of Warcraft (Wow) Legion Reputations additional information:

• The Nightfallen reputation Earned By Hitting 110, then completing World Quests and progressing on the Suramar storyline.
• Valarjar Reputation Earned By Questing through Stormheim. Hitting 110 and completing World Quests, mostly found in Stormheim.
• The Wardens Reputation Earned By Hitting 110 and completing World Quests, which are spread out across Broken Isle zones.
• Dreamweavers Reputation Earned By Questing through Val'sharah. Hitting 110 and completing World Quests, mostly found in Val'sharah.
• Highmountain Tribe Reputation Earned By Questing through Highmountain. Hitting 110 and completing World Quests, mostly found in Highmountain.
• Court of Farondis Reputation Earned By Questing through Azsuna. Hitting 110 and completing World Quests, mostly found in Azsuna.