Your most disappointing purchase or audition?


I've had a few.

bought a Naim Nait 3. Loved it in the store. Returned it within a week- way forward at home

Brought home some CJ preamp to audition perhaps 22 years ago. Noisy as anything and a turn off transient destroyed a tweeter (though years later i bought a CJ 17LS2 which I thought was the finest preamp I ever heard in my home)

Auditioned a VPI table (HW19) in a store- the store just could not get the belt to stay on. Bought a Rega instead. This was in perhaps 1990.

Fortunately, I never really experienced buyers remorse say 6 months or more after settling on a piece of gear.

Finally, there have been too many speakers that got stellar write ups which I just didn't care for.
128x128zavato
Muse 175 monoblocks. A short while after getting them, I noticed a problem--a kind of distortion triggered by a few passages on certain CDs. The problem followed the monoblock when I moved it from one speaker to the other. Sent it back to Muse, and it came back not fixed. Finally sold them on to a store, disclosing the history. Muse seem to have gone under not long thereafter.

Thiel 3.6. First five seconds of music and a tweeter goes up in smoke. Apparently used a "bad" batch of glue in its construction. After many phone calls, got it fixed. But I soon let it go--just too cold and analytical, and early digital DGG recordings sounded dreadful on it.

Threshold pre-amp; forget the model, but expensive, late model (shortly before the company closed; hmmm, is there a pattern here?). Remote volume control stopped working weeks after purchase.
Mel,
I take your point as well...those incidents are frustrating and can stay with you for a long while. It has happened to me as well.
Two amplifiers.

VAC PA 100/100 and Sonic Frontiers Power 2. Couldn't get rid of them fast enough.

Speakers.

Wilson Sophias. I really wanted to like these and they did some things well. But the midrange was too smooth and unnatural sounding. Moved them out pretty quickly.

Coincident Super Eclipse and Aerial 7B. Just too boring and mid-fi sounding. Not terrible, just so-so. Sold both of them again in less than a week.

Shakey
Philips SACD 1000. Lasted slightly over a year, terrible parts quality, everyone failed in the field. Everyone. Philips is on my do not touch lost, not even for a light bulb.
The SACD 1000 was likely the single most unreliable piece of hi fi in the last 25 years. 100% eventual failure rate and no available repair. I have a Mitsubishi TV in my basement, bought in 86, that just won't die.