I ordered two of these Noise Eaters for my hi-hat standard and kick drum pedal.
This is essentially a small rubber mat, with soft, absorbing half balls on the bottom.
These balls compress when the pedal is hit on the mat and takes out some of the thump for neighbours and in rooms downstairs.
These definitely work and reduced the noise transferred downstairs, although it is more effective with the kick pedal than the hi-hat stand.
I am still planning on building a drum platform as these don't take out all of the noise or vibration. But if you want to make a start in reducing noise and vibration, then this is worth considering.
Depending on your house construction and placement of the kit, these may be enough with out any additional padding or platform.
I feel they are a bit pricey for what they are, but you can't put a price on not upsetting your neighbours or the 'other half'. These are extremely well made and are pretty effective.