I started with his latest offering the UR (Ultimate Reference) i/c 0.5m to put between my Arcam CD72T and Primare A20 mk II.
I then thought about speaker cables, so I got a used pair of his previous model SR (Silver Reference) to put on the above system.
Then I decided to try an SR i/c for my secondary system at the other end of the country, not much used, but wanted some of the "Grover" flavour.
All of the above have given welcome improvements.
Grover welcomes any questions you may have via the 'contact us' button at the very bottom of the page I posted. However he has been flooded with orders and is having a rest 'til the first week of Sep. I believe. I think he still operates a money back guarantee.
Shipping rates are generally $10, and the prices of the cables are greatly in favour of us in the U.K. given the outstanding £-$ rate at present.
As I said before, I am not a salesman for Grover, I just want to share such an improvement in sound.
I urge you to read the text and try one, although there may be a 2 month wait time.
Cheers.