Originally Posted by ACBLtd

Some reporting here has suggested that the price offered is more like an upfare than an upgrade. It's the amount to buy the cheapest current seat in First Class. This means that it's dynamic and personal, but only to the extent that it represents an upfare from whatever fare each passenger previously paid into whatever fare bucket (and advance purchase) is available at the time of looking at the upgrade cost.

I agree that it's frustrating to see a flight at J4 or more at the 120-hour window and have to hope they release seats into U before someone upfares to get the seat before you get upgraded.