I got these for my 14 year old son who just got into cubes. He's found them to be fun, sturdy, and easy to use.At first there was a little concern that they were tight and turned slowly, but with a really short bit of use they got comfortable. My 14 year old is not exactly what you would call gentle, and these cubes have been dropped multiple times. All of them are sturdy, although the smallest with four cubes is not the smoothest in movement. It still seems sturdy and all of the rest feel solid in their movement.The colors on these are nice and solid, with no stickers that would peel or fall off. My son has been using these and sharing them with their friends for a week now and they are still solid, so they feel like they are good quality.I would recommend these for anyone looking for a variety of cube puzzles, particularly for a young teen or older pre-teen (not that I haven't played with them too!)
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