2 pages in and no ones mentioned the god of chairs, the Marcus from IKEA, £150 and lasts for ever
The
IKEA Markus is, in my opinion, a good and solid "starter" chair.
However, it doesn't last forever in my experience.
As another poster noted above, the seat padding (foam) loses its integrity (goes flat) very quickly.
My experience with my own IKEA Markus was that it served me well at first, but then the seat foam/padding went flat -- roughly after about
1.5 to 2 years. This resulted in a very uncomfortbale seating experience.
In my own case, I decided that a good, and reasonably affordable replacement to an IKEA Markus, was either a refurbished
Steelcase or
Herman Miller chair, dependent on preference. I chose a refurbished
Steelcase Amia, and would confidently recommend that chair, so long as a good example can be obtained.
Outside that, nowadays, I'd also consider one of the many available brand-new mass-market
Sihoo brand chairs, which, after a little bit of research, appear to be much better than I originally considered them to be.