If you buy any knock off legos, you are guaranteed 3 things, 1. Crappy instructions 2. Noticing the snap pressure is inconsistent and often too tight our bouncy. 3. Swearing at that manufacturer after every page.
I thought this forum was for intellectual discussion, full of intellectual people. You're a pseudo-intellectual at best.
Let me add this: 4. no spare parts available. So when I break weird Chinese invention the whole set becomes useless without that very special part. It happened few times and I got back to used Lego sets.