Great idea and I will definitely try other brands of sensory blocks (Plan, Maxim) but disappointed in the quality. Most blocks have wooden dowels holding the inside sensory items, and stick out of the sides, making the blocks not only difficult to stack, but also very unfinished/sloppy looking. That being said I will probably sand them down and continue to use them, my 8 month old doesn’t care how they look, she loves knocking them over and hearing what sounds they make, but probably would not buy again.

These blocks are great. I have no issues with the quality of the mirror, the push button block, or the kaleidoscope.

We really enjoy the differences in the blocks and my son particularly loves the bell one and the rattle one. To echo a previous review, it's true that some of them are a bit disappointing but we love Haba brand and this set for the price seemed worth it.