Clearly a product of the Corman School, Sayles's first major screenplay shows that he already knew how to tell a great story from an interesting angle, something he has never forgotten how to do.
Director Teague keeps the pace rattling along, and hammers the message home fast (he was an occasional assistant to Sam Fuller, of course).
The plot's quite straightforward, and all the better so - this packs something of the punch of the 30's classic gangster films, but with distinctly 70's sensibilities to violence.
Where the film becomes more interesting than your average low-budget 'gangster-exploiter', however, is in the telling of the story through her eyes, rather than his (a distinctly 70's approach). Yet it's wonderfully ambiguous, on reflection, as to whether the film champions her willingness to break away and start acting for herself (she's a great strong character), or whether she just goes from one woman in peril situation to the other (which is the plot, basically).
I've probably over-analyzed it already, but if you've got a spare hour and a half on your hands, give it a chance. A classic of its kind.