Has anyone tried these toppers? Is is another case of marketing hype and fad or is there some element of truth?

The pads are pretty pricey but available much cheaper on ebay etc.

 

Their website is

http://nettrax.myvoffice.com/nikkenusa/ShoppingCart/Shop.cfm?CurrPage=CategoryDetail&NextPage=CategoryDetail&CategoryID=551&pid=37424173659946209

Thanks for your responses.