  We present the X-ray properties and scaling relations of a flux-limited
morphology-unbiased sample of 12 X-ray luminous galaxy clusters at redshift
around 0.2 based on XMM-Newton observations. The scaled radial profiles are
characterized by a self-similar behavior at radii outside the cluster cores
(>0.2 r500) for the temperature, surface brightness, entropy, gas mass and
total mass. The cluster cores contribute up to 70% of the bolometric X-ray
luminosity. The X-ray scaling relations and their scatter are sensitive to the
presence of the cool cores. Using the X-ray luminosity corrected for the
cluster central region and the temperature measured excluding the cluster
central region, the normalization agrees to better than 10% for the cool core
clusters and non-cool core clusters, irrelevant to the cluster morphology. No
evolution of the X-ray scaling relations was observed comparing this sample to
the nearby and more distant samples. With the current observations, the cluster
temperature and luminosity can be used as reliable mass indicators with the
mass scatter within 20%. Mass discrepancies remain between X-ray and lensing
and lead to larger scatter in the scaling relations using the lensing masses
(e.g. ~40% for the luminosity--mass relation) than using the X-ray masses
(<20%) due to the possible reasons discussed.
