B17 saddle. 1000 miles of total misery until I sold it and bought a Specialized Body Geometry saddle which was comfortable from day one and still comfortable 10000 miles later when I sold the bike.
Seal Skins gloves. Not waterproof, they let in water after a half hour or so and a horrible feel to them. Worn once and still in the drawer.
Reel lights. Pathetic brightness. One of the few lights that seem to make things darker, plus they failed after 1000 miles. A great idea poorly executed.
We need a thread with best things we bought too!