Most will view it as unfair, but for different reasons.
Some will feel it is unfair because it is a save-or-die with a ridiculously high DC.
(failing on a 19 means there is only a 5% chance of success, assuming a 20 always saves)
Some will feel it is unfair because it is an obvious DM-built temptation.
Some will feel it is unfair simply because it is a save-or-die.
Those who feel it is fair can reasonably argue that nothing forces a PC to pull the lever.
Some will feel it is unfair because it is a save-or-die with a ridiculously high DC.
(failing on a 19 means there is only a 5% chance of success, assuming a 20 always saves)
Some will feel it is unfair because it is an obvious DM-built temptation.
Some will feel it is unfair simply because it is a save-or-die.
Those who feel it is fair can reasonably argue that nothing forces a PC to pull the lever.