Looks like a pretty decent replacement.I too am a fan of oem looking radios. I strongly considered the Blau SQR but ultimately I could not justify the price. Instead I went with a VDO Continental which also a well known oem substitute looking radio in the German car forums. See below for install. It has Bluetooth Audi etc, basically everything I need, for about $150
I think though for me, the bottom left knob and the upper left screen of the bremen is what does it.
Still, you are right, $500.
Not sure i've ever spent that much to get so little, but there is first for everything i guess...