Here is a thread about the Grid-Viva:
I wanted to give my newly acquired Sebenza 31 a proper edge so I decided to give it the Rolls Royce treatment using my Grid Viva sharpening system. Arguably one of the best sharpening systems on the planet. The tolerances and workmanship of the Grid Viva is absolutely insane - which pairs up...
www.bladeforums.com
As far as my general recommendation goes, the best all-round high-end sharpening system (when looking at a combination of availability, quality, price, upgradeability, modularity, future support, usability and accuracy) remains to be the Hapstone R2 Standard system in my opinion.
Hapstone is widely available, has a proven track record and it's made by a company that specializes in knife sharpening systems specifically.