No, I haven't.  I have got a rack that I had made to order and it's a rip off of the IsoBlue rack (which apparently is loved by you flatties).  However, I got that rack because I like the look of it, it's all made of wood and it's very practical.

I can't say I noticed any sonic differences when using it.  I've also played around with Vibrapods and various cones and spikes under my CD transport and they've all had little or no effect - only the Vibrapods (which I still have under the transport) made any difference I would swear by.

Contrary to what Isaac thought, I didn't think the seismic sink made a huge difference at Dino's bake-off.  I was however in a very poor position to make a judgement (crouched on the floor next to the right hand speaker).

My experience with supports/isolation etc. therefore leads me to think it wouldn't make a huge difference.   Note however, that I'm not writing them off or suggesting that they are audiophoolery or anything else.  They logically ought to make a difference but so far I haven't heard it is all I'm saying.

I'd certainly be willing to give a seismic sink or Mana a try at home if I could have a free home dem.  AFAIK there are no Mana distributors or dealers in Portugal though

Michael.