I've done a lot of experimenting with the Quicksilver, yes, it does sound brighter at first but over the long run the brightness disappears. Over long term use I've noticed no changes in tonality.
Some might say I'm just getting used to the added brightness. I doubt that is the case because I've done tons of tweaks over the years, some have remained, some have gone. Sometimes I can even be fooled for a few weeks, perhaps even months, but in the long term I do hear the pros and cons. Quicksilver has remained in my system for well over a year now. As usual YMMV.
Some might say I'm just getting used to the added brightness. I doubt that is the case because I've done tons of tweaks over the years, some have remained, some have gone. Sometimes I can even be fooled for a few weeks, perhaps even months, but in the long term I do hear the pros and cons. Quicksilver has remained in my system for well over a year now. As usual YMMV.