Good (and rather small) investment, imo, if you need to otherwise have your monitors on a hard surface (table), rather than dedicated monitor stands - or even in the case of stands, they can easily resonate if not decoupled from the monitors. And of course, the angling is a nice bonus (if needed). I think there are some knockoff "mo-pads" that are just light foam, which can be less useful. Still, something that absorbs the vibration should always do good.