This has been tried in the balance and found wanting (see "Reviews"). However, there are folk out there who swear by it, rather than at it, the way I do, so this is your chance to pick up this worthless bit of crud, er, significant performance enhancer cheaply. Yours for EUR 15 inc. p&p ONO. Otherwise I use it as a mat for my teacup (actually, it's not even good at that).