While you're waiting for the 3.1.0 patch notes, here's another upcoming unique!

How many uniques are there? Think we're way past 500. They can't all be "useful" by most player's meaning of the term. They can't all be game-changers.

The real problem is that the game is getting too complicated for even GGG to understand the implications of adding more to it. They really need to step back and stabilize their game.