Big cubes are the latest trend in high-end cocktail bars because of their slower melt rate (less surface area) and curious look. This is a great home version that produces gorgeous 2x2 cubes. It does take a bit more effort to extract the cubes from the rubbery silicone material than traditional trays -- you have to sort of stretch and push them out -- but for big cubes it's actually advantageous to carefully slide them out this way, rather than "cracking" them out and risking fractures. You'll get the hang of it.
The BIG problem I had with this initially was that the cubes produced white "floaties" in the drink that left a rather waxy residue on the glass(!). I'm not making this up! What the heck are those? I googled it and it appears that this is a problem that some people experience with silicone trays. The best theory I found was that it's related to the effect silicone has on freezing certain types of water, perhaps condensing minerals on the surface of the cubes. It's just a theory. But I figured out a workaround which I am happy to share with the internet via this amazon review. If you experience this, just RINSE the cubes briefly before you drop them in the drink, and it will wash off the white reside. All good! I love my big cubes now.