The results (positive or negative) from using ANY form of vibration control on an ANY component will vary according to the particular design of the model, system synergy/tuning and personal taste. The only way to determine what will work depends on experimentation. At a dealership, I heard the use of such devices under various CD players and there was no single product that was consistently helpful under all models. For example, the Symposium Ultra shelf (vibration drain) is incredibly effective at what it is designed to do. Use under some CD players resulted in greater clarity, detail and more obvious microdynamic contrast. But, under an Aero Capitole player, the sound became WAY too dry and lean. Under my own player (Naim CD555) the platform had very little effect. I've also done some experimenting with footers and Symposium rollerballs, etc. and I also find the same thing--sometimes the result is good, sometimes not. I don't think there is any kind of consistent "right" approach.
The same is true with all other components. While the most common approach with speaker is to couple the speaker/stand to the floor with spikes, I often find alternative, decoupled approach, works better on suspended, wooden floors. My speakers sit on Symposium Ultra shelves which have a soft inner core that drains/absorbs vibration from the speaker. I am just guessing, but, this probably keeps the floor itself from acting like a sounding board. Again, only experimentation will give a meaningful answer.
The same is true with all other components. While the most common approach with speaker is to couple the speaker/stand to the floor with spikes, I often find alternative, decoupled approach, works better on suspended, wooden floors. My speakers sit on Symposium Ultra shelves which have a soft inner core that drains/absorbs vibration from the speaker. I am just guessing, but, this probably keeps the floor itself from acting like a sounding board. Again, only experimentation will give a meaningful answer.