IsoAcoustics ISO-200Sub

I'm using this under a Neumann kh750 sub. Before, when it was sitting directly on the floor, you could literally feel the floor shaking pretty much anywhere in the room. After adding the ISO-200Sub, the only thing that shakes is my insides if I get a bit over-enthusiastic with the volume knob!

This goes together in seconds, and once the sub is resting on it you can literally feel how effective it is: play some music, and touch the top half of the stand - you can feel the vibrations; now touch the half near the floor - there's practically nothing going on at all.

I feel the sub is even a hair cleaner than it was when on the floor (but this is tricky to confirm, as the kh750 is already a very, very clean unit)

Highly recommended product - it might seem a bit pricey, but if you've invested a chunk of cash in a good sub, I'd say this is an almost-essential accessory.

I bought two of these to decouple my monitors from the desk, these are supposed to be used for subs and there are models specific for monitors but I chose this one because its dimensions fit my monitors better.
Previously I was using foam decouplers and this was a major upgrade. The desk no longer picks up vibration from the monitors and there's a noticeable improvement on the speaker's response.

These are easy to assemble, very sturdy, they look better than the foam decouplers and are more effective at decoupling the monitors.
In my opinion there are no cons with this product