Neat for tasting notes, but my go to is a single 1" cube slowly melting into a 2 oz pour in a glencairn glass. I usually drink this over 1.5-2 hours so it starts out full strength and is cold the first hour or so, and warm (hand temperature) at the end. I like the range of flavors you get this way.
I make my ice in a silicon tray and use bottled spring water.
I do this with scotch too, much to the chagrin of snobby single malters