My setup: Macbook Pro early 2011 via the Belkin Mini DisplayPort to Mini DisplayPort cable and the LogiLink Mini DisplayPort to DisplayPort Male Female Converter with a Dell U2412M Monitor. At first it wanted to see the screen on either OS X or on Windows 7, but after several times and insert it now works super =) 5 stars.
I had ordered at lets-sell: The delivery took a week. Since the shipping confirmation came quickly, however, and the support has also responded within an hour, I suppose that the long shipping time was due to DHL and not with lets-sell !.