You should definitely buy this! its the ultimate way to play Halo!
Here are some pros vs cons

Pros:
Low price for the value
perfect multiplayer
tons of games and game modes
forge
firefight
campaign
8 free season's battle pass
tons of customization
great modding community
custom game browser and severs
Outstanding story and replay ability
local coop
online/offline working
tons of general settings and accessibility settings
endless game play loop!

Cons:
there is none.

10/10 this is definitely worth buying!