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Since 2005, the Free-Electron Laser FLASH at DESY delivers radiation pulses with unprecedented parameters to scientific users. Pulses in the 10 femtosecond range are produced at record wavelengths as short as 13 nanometers. Operating in the FEL saturation regime at the Gigawatt level, even higher harmonics are generated that are powerful enough to be attractive for users. Radiation pulses and the properties of electron bunches have been characterized in quite some detail. Based on these results, the state of the art of detailed comparison between the theory and experiment of short wavelength SASE FELs will be presented.
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