Go Unlimited Plan. 600kbs per sec is ridiculous by today's standards. The only thing unlimited with Verizon is how much money they will require to use their product$ and $ervices. As long as they monopolize the towers and bandwidth Verizon can continue ripping us off. Write to Congress. This won't stop until Verizon is legally bound to be held accountable for monopolization and consumer abuses.
As long as Verizon has different tiers of unlimited data with the features of each one clearly stated, this is not false advertising. If you choose to subscribe to the LOWEST tier of unlimited data which can have your data reprioritized AT ANY TIME there is congestion on a tower, then you will have to live within the restrictions of that plan.
Would you prefer Verizon to only have one tier of unlimited data with a much higher cost? That is what would likely happen if Verizon were not allowed to have different unlimited data tiers with differing amounts of high speed data. That would be no different then if you were currently on a higher tier of unlimited data.
Be careful what you wish for if you don't want your unlimited data cost to increase. IF Verizon is forced to stop offering a tier with similar restrictions to what is available with Go Unlimited, then the price of your unlimited data will most certainly increase to a price more in line with one of the currently available plans with some of the data with a data threshold before it can be re-prioritized.