What's the most overrated or overpriced piece of equipment you own, have owned or come by?

One poster said no one here ever admits to owning Bose.

I own a pair of Bose noise cancelling ear buds, which I use on airplanes. And they are EXCELLENT for what they are designed to do.

Are they high fidelity? I have no clue, but they do cancel out a ton of airplane engine droning, and makes flying more enjoyable. Not only not overpriced for what they do (costs less than a decent interconnect), they actually work as well. 

On on the other hand, is there any Bose equipment in my home setup? Uh, no. 

The most trouble-prone piece I ever owned was a Thorens TD-125 Mk.2 turntable. The electronics were evidently malfunctioning, causing intermittent "motorboating". I took it to the warranty service center many times, the problem never being found or solved. The table would never exhibit the motorboating at the center, of course. I was very young, and ending up getting rid of it. Now, I would demand the whole electronic circuit board be replaced. Why that wasn’t just done to solve the problem I have no idea.

Luckily I've never owned a regrettable piece of kit. But I do research the heck out of something and nearly always audition before buying. I also avoid flavor-of-the-month kinds of gear.

My regrets have not been in what I have bought but in what I have sold. 

mesch good point.   Me too!