Over the last few months I have been using both the piezography software and inks and other inks, printing a selection of my 4x5 black and white negatives, which I have scanned using an Agfa Duoscan HiD.
I'll get to the point ; I would actively dissuade anyone from the expense and hassle of piezography. It is very poor value for money, the inks regularly clog the printer nozzles, the technical support which is touted on the web site is non-existent, the tone of the prints is an unpleasant warm brown, very far removed from the selenium toned effect many would wish to have for their prints, and most importantly, it is not as good quality as other, much better value options currently on the market. In my view, the claims that they make are vastly overstated and little more than marketing hype. I simply do not believe their claim that they can get the Epson printers to print at greater than 1140 dpi - or if they can, their technical service department has never bothered to answer any of my queries on this. Much of the ink is wasted on cleaning clogs from the printer nozzles - incredibly frustrating!
I have found my best option to be to use the Lyson quadblack cool inkset. It does not clog and produces results which are far superior both technically and aesthetically to piezography, IMHO. I have absolutely no affiliation to Lyson, by the way.
Through much trial and error, I have found that the best approach is to scan a 4x5 negative either at original size at 2000 lpi (maximum resolution), or at 150% size at 1333 lpi. Both of these scans produce a 290 mb file. After some limited work in Photoshop, I can either print this size, or configure a print file for a larger size while keeping the resolution the same (i.e. interpolation). An A3 sized print will have a print file of between 650 - 850 mb in size, which does take about 10 - 15 minutes cpu processing time, and about 10 minutes printing time, but the quality is really excellent - close to exhibition quality. I do feel that I have at last found a viable high quality printing technique that I can control myself from exposure right through to final print.
I regard the money I spent on the piezography software as an expensive mistake. Having a high quality digital printing setup can be better achieved through other options.