Your single most significant purchase mistake?

Your most significant regret for having bought? Big expectations and an even bigger letdown? The one you kicked yourself the hardest for ever having bight 


My mistake was in not buying something- two 10B tuners- $1,200; that was for the pair- 

VAC PA 100/100. Sounded horrible. Took it over to a friend's house. Horrible there too. One week from opening the box to packing the box.

Sonic Frontiers Power 2. Very sterile sounding with a midbass bump that was very annoying. Kept this one for a couple of months thinking I had a room/speaker issue. As soon as I replaced it, the problem went away.