One thing Audio Widgets?

Has anyone tried these for the Quad ESL 63? I am interested in any comments, opinions, reactions to them,
If you are running tubes with an output transformer (non otl) you may want to try bypassing the electrolytic cap on the input (part of a dc blocking network if I recall). I have no experience with the widget fwiw.
I am running tube monos, non-otl. The widgets appear to be similar to what you are describing, but with other components as well.