The stones are well made. 2-3 stones are a little crooked, but does not in my opinion at the price and in proportion to the amount of (500) to point deduction. The fittings of the box are very simple, but correspond to the price-performance ratio.
With the modules you can create beautiful buildings and hours of fun. Educationally valuable.
The Kappla blocks are certainly valent that of other material but instead they are also more expensive.