ESO Plus offers members exclusive in-game bonuses, a reoccurring allotment of crowns and access to all downloadable content (DLC) game packs for the duration of membership:

30-day Membership:
1500 crowns at the start of each 30-day membership period
Access to all downloadable content for the duration of membership
Exclusive character progression bonuses for the duration of membership
10% bonus to experience point gain
10% bonus to crafting research
10% bonus to crafting inspiration gain
10% bonus to gold acquisition

90-day Membership:
4500 crowns at the start of each 90-day membership period
Access to all downloadable content for the duration of membership
Exclusive character progression bonuses for the duration of membership
10% bonus to experience point gain
10% bonus to crafting research
10% bonus to crafting inspiration gain
10% bonus to gold acquisition

180-day Membership:
9000 crowns at the start of each 180-day membership period
Access to all downloadable content for the duration of membership
Exclusive character progression bonuses for the duration of membership
10% bonus to experience point gain
10% bonus to crafting research
10% bonus to crafting inspiration gain
10% bonus to gold acquisition