Hi Duncan! Many thanks for the reply and for the link, which is awesome! You played one of Brian's personal basses? How cool is that! I have to ask how it was set up.....
I did actually play one very briefly some years ago, but not enough to form an opinion. When they came out in the UK they were ?1999 (they were $1999 in the US, retail), and I've seen one in the UK before used for ?850, but the one I've just seen is only ?450 (around $800), which is less than the price of a mexican Fender; not bad for a bass with a Modulus neck and high tech electronics. I get the impression they were never that popular, which is a shame (although good if you can find a used one!).
The footage I have of Brian is from a German satellite channel, only one song (I don't even know what it is), but Brian takes a beautiful melodic solo on his natural B Quad; lovely tone and lyrical phrasing.