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.