Can we hear from those who essentially repurchased previous system?

Are you someone who had Speaker A or Amp X, sold it on the proverbial merry-go-round yet repurchased that same piece of gear--only to build a system around it?

If ’Yes" then...

What was the piece (type/make/model)?
Did the product that brought you back do something a less expensive/more expensive product did not do or that it did wrong?