Product review (2 stars): Not the best quality ice
My friend has a clear ice cube maker and the cubes he gets out of it are perfect cubes and perfectly clear.  However, the cubes from the Luma are not perfect cubes, and the ice, while mostly clear, is not perfectly clear.  A big disappointment in comparison to my friend's device.

1) They have a hole in on one side that extends to the middle of the cube where the water has failed to freeze.
2) The cubes tend to be stuck together into a single slab for each batch produced, so you have to smash or split them by hand to turn them into individual cubes.  These cubes then have fairly random shapes, approximating cubes, but much more random, and when combined with the holes in them it is all pretty messy (unlike the picture perfect clear cubes produces by friends ice maker).
3) In addition, the process of splitting cubes leaves the cubes looking not so clear (because they have rough edges that are not clear).  As the cubes melt in a drink they become clear again, so this is not too bad.
4) There is an option to make "thicker" ice, but this does not eliminate the holes in the cubes and just makes the slab of cubes produced in each batch even harder to separate into individual cubes.