Step down isolation transformer

as a solution for 110/220 input 110 output active conditioner ?
With it I could use any 110V passive conditioner with 110V gear in Europe.
Does anybody have any experience how does step down transformers influence sound quality ?
See my previous post on this subject. I had no trouble using my US (110V) equipment in Europe for 3 years using a step-down transformer.
I understand that you do not have electrical troubles.
Did you notice any change in sound quality.
What step down transformer are you using ?