Lets keep the discussion civil please, so the thread doesn't get locked.
The tooltip apparently is bugged. Full discussion here:
Per the suggestion of one of the posters in that thread, posting this in general. I keep seeing so many people post in that thread that say "I wish I'd known before I bought it."
Edit: People think they're getting this:
But they're really getting this:
Note the tooltip in-game on both the pattern and the sword is wrong.