No, the speed is the same, regardless of the package or total usage. There are no hotspot channels on-board. Everyone, regardless of package, competes for the same bandwidth...for a slice of the same pie. There is no upper limit to total usage, like you might have on a phone, where your speed is throttled. Bandwidth is not the same as total number of MB downloaded. Everyone is in the same boat (literally and figuratively), and shares the total bandwidth available to the ship. So speed of an individual connection depends on how many are competing for the same bandwidth. And the ship's total bandwidth isn't great.
There is no advantage to the upgrade except for access to streaming channels.
We all hope for WiFi upgrades on all of O's ships, but are not holding our breath.