A further play with TrueGrain reveals it to be a very intuitive application to use... (for us greybeards with chemical darkroom experience, at any rate)

The software runs well on a 17inch 1.33GHz G4 PowerBook with 2GB RAM. I opened 41Mb 16bit .tif files without any obvious slowness and if anything, the files appeared to be opened quicker than if opened in Photoshop.
I have attached three very quickly processed results (<10 seconds processing time for each image) from a single light, location shoot and the final image is shown with a colour/mono split screen to give some idea about the image files that the mono images were derived from.
I had set the film type to HP5 at ISO 400 with a light green contrast filter (those contrast filters were an inspired addition) and the resulting images look very pleasant to my jaded eyes.
EDIT: to add that these are simple 72ppi screen grabs and I took them into Photoshop to save them as jpg files. (my screen grab is set to save PNG files and I wanted to upload smaller data files)
Any comments?
Regards,
Jeff