Subwoofer Isolation Pads?

[SPIDERone]

I see some Subwoofer Isolation Pads (or feet) being sold online. They don't come super cheap (4 feet for the SVS seem to be $50). They're sold as a way to cut down on ground vibrations through multiple rooms (ie: apartments, or multiple rooms in a house) while also giving cleaner/tighter sounding bass.

https://www.amazon.com/SVS-SoundPath.../dp/B00NCSQ5GK

Both would be nice to have -- as long as they don't affect the actual quality of the sound. Has anyone used these before? any feedback from actual users?

I have 3 subs and really enjoy the sound of them, but I also hear things rattling (and can hear some bass from other rooms). With a high price (for what they are; $150 for 3 pairs of replacement subwoofer feet), you'd want something that both works and does not affect the quality of your subwoofer.

These would be for use on wooden floors