I use a 5 gal home deport bucket that sometimes has bits of paint flakes still floating in it. The residual chemicals bring out a certain bite that covers up for my cheap honey choices.

/sarc

Seriously though -- what sort of actual differences do you notice vs aging in a standard carboy? Have you ever done a portion of the same batch in a small carboy to see if there is an actual difference or just perceived? I ask because I often wonder how much of the brewing hobby is like shooting, where the equipment's difference making is all in the mind of the user rather than actually being better.