I myself have not done this, but more than a few have tired of the limitations of the original Quad ESL loudspeaker, bought another design free of that limitation, then another, ending up coming back to the Quad. Within its' limitations, it remains unsurpassed by any, equaled by few.
The one product I have deserted and then returned to is the Decca (now London) cartridge. The Decca, much like the Quad, was great in most ways, seriously bad in others. The good news is that Decca employee/engineer John Wright bought the rights to the design, updated and improved it, and reintroduced it in its' London form, free of most of the Decca's problems.