and as I read more: "Gläce states that the cubes are ideal for high-end cocktails -- those that employ splashes of $38,000-per-bottle liquors, and must not be diluted or contaminated by mere tap ice." ... ICE NUMBS YOUR TASTE BUDS. Fancy water or not.
edit: Downvoted to -1? I'll double down. If you are going to drink a nice scotch on the rocks, do yourself a favor and buy cheap scotch instead. Go enjoy a Johnnie Walker Red or Cutty Sark. There are aldehydes and esters from the peating of the grain and the oak cask aging that you are not appreciating when it's chilled. If it's cask strength (around 125 proof) then by all means dilute with spring water so you don't burn out your palate. But if you drink it on the rocks, try not doing that and see if you enjoy it differently.