...if you want a machine that is upgrade-able. I always got problems when I should for a friend change something at a medion-pc or integrate a new card (like modem / video).
Also, installation of other oses (even other windows!) could be troublesome.
Additionally, I made very bad experiences with their "support", too.
But if you want a pc which configuration will never be changed, than you could buy it. Otherwise you might consider other offers; many shops like atelco, kosatec etc. have cheap pcs, too.

btw.: it's a pity that plus is now selling medion, too. In the past, they were selling pc-s out of standard-components which were less troublesome.