I have one of these in wife's car, perfectly good head unit but it did only cost around £100 four years ago, totally agree very overpriced.
I am interested to know though about the 100 times better units, this unit features radio, CD and USB - have £100 double din stereos really come on much more in the last few years? Not everyone want's a £1500 multimedia unit bolted to the front of their dash.
I don't really see what else you'd need in a budget stereo, the XR411 is a much nicer unit than the standard Bose HU but I was perfectly happy with the Bose in the zed, both units do what they say on the tin.