Quickly sat ...

Have the chair about 4 weeks now and am sitting on average 3 hours per day on it (weighing almost 70kg). I regret to say that the seat cushion is already so worn-out that I've slowly feel the hard substructure. My previous office chair was cheaper than the here and there I have not experienced after 2 years Such.
A star for the design, to sit definitely a mistake.

After about 6 months the chair creaks with every movement. Unfortunately, I can not figure out where. I can not get back to disconnect the chair from the foot, otherwise I would have there can lubricate slightly.