It's a good buy for the money. Tangram shapes are expensive and all I've seen are made out of plastic. This set has colorful, durable shapes but, to my disappointment, there are no rectangular shapes included (you can only make it out of 2 squares but there are not enough square shapes in the set!). I have two kids and when we play together we need to wait our turn using some shapes. 100 pcs. might seem a lot but it's only enough for maybe one child. All in all, we love this set and I am thinking to either buy the 250 pcs set to complement this one or get the 450 pcs set from Power Polygons (which includes rectangular shapes but it's made out of "see through" plastic which it's not too appealing to me at least).
I bought these based on the previous review. The pieces are sturdy and colorful, but very small. The whole bag of 100pcs. is 5" x 5" x 1". Considering that they are molded plastic, I think the price is too high.