c't has changed very much since the late 80s and early 90s. Then it was a cool magazine for people with a deep understanding of computers. They served a wide diversity of computers like amiga, atari st, c64, cpc and had difficult to understand articles about programming, AI, algorithms, 3d rendering and even about building hardware. They went the same way as e.g. Byte. They realised that the market for stupid users was much bigger and changed their mag for the mass market. Today few articles are fine, other articles are bad and most of the articles are tests of windows software. (Other posters want to tell you, that c't is pro linux. Most of the time they only have one page of linux in a 500 pages magazine).