whats the biggest mistake you made?

ever sell a peice of gear then realize you made one big mistake or find a better way to run it after its allready gone?

for me it was the mcintosh mc2102 tube amp that wasnt cuttin the mustard or so i thought,since then ive tried many amps & none have gave me the same feeling as that amp.

most of the changes ive made over the years have been good or atleast i could live with them but that one change really taught me alot,im taking things alot slower nowdays & taking the time to hear the different gear i bring in before rushing to decisions.

mike.