Has anybody had any experience with the Bike Brightz
[www.bikebrightz.com] lighting system. Or something similar?

=v= No experience with that, but some friends have these:

http://rockthebike.com/lights/downlowglow

They look snazzy (in a certain urban aesthtic sense) and are
certainly visible.

I wouldn't be seen dead with one.

=v= Given that these call themselves "bike halos," might we
infer that you might instead be seen dead with some manner
of bike horns and pitchfork? ;^)
_Jym_