From the first reviews, it seems they are able to make perfectly crystal clear ice balls, not the usual cloudy ice cubes. (Although, this picture shows otherwise.)
Twelve 2.5" ( $1,499 FirstBuild Clear Ice System) vs three 2" ice balls (LG) in every 24 hours.
I guess it all depends how fast and often you want your ice balls. A drink per night for 2 is fine. To prepare for a party with the LG fridge, you need to start making ice a week before.
