I finally got to trying out my JetStar inkjet film this week, and was more than satisfied with the results:
I drew up the plans in ExpressBCB before realising that it has somewhat limited print options - i.e. you can't get to the printer properties dialog... but discovered this is easily circumvented by printing to the MS XPS device, and then printing the resultant file from IE - comes out at exact scale without any messing around.
Chosing "Inkjet transparency" paper and High quality photo printing on my Epson R300, the black was not as black as I'd hoped - still a bit translucent when holding it up to the light, but I did a test exposure from 1 to 10 minutes and experienced no bleed-through exposure what so ever. Everything from 2 mins on developed fine.
For the actual boards, I gave them 2min 30 sec, and the only issue I had through to the etched boards were where the photoresist coating was actually damaged in a small area of the larger one.
These are the first boards I've produced in probably 25+ years - it gave me a real nostalgia trip back to my teenage years! If only it were so easy to produce the artwork in those days!