Quality appears to be normal. They interlock snugly and while I haven't tested this with the Lego brand, they appear to be the right size to work with Lego. My problem with them is that they are almost exclusively small pieces. I opened a bag of 6 or 7 in a box and there were about 130 1x1s, about 65 2x1s and 55 of everything else together which I lined up so you can see how many each is. Until I open all the bags, they all seem to have the same contents. I bought them for a small project I'm doing and it just won't work to build that project let alone build anything. I will send these back.
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