Mark, I've had decent results with fomapan.
Ok, it's rare I get an image I'd sell, but I lack a
Polaroid back, so that is what fomapan is for.
I'll do my test shots one day, then head back
the next with good film. Yeah, it requires me to
be anal retentive about recording data, but I
shoot primarily cityscapes and urban exploring
shots.
Occasionally (ok, twice,) I've used fomapan on
paying gigs, but the shoot was urban
exploration based do the craptacular nature of
fomapan actually added to the finished
product.