Based on user comments, forum posts, and online chatter, most users agree that the printer is easy to set up, easy to use, has a very high quality output, good media handling, and is durable. When users have needed to go to Canon for problems, virtually everyone was satisfied with the support.
An ongoing issue found in virtually every source I checked is dissatisfaction with the printer's performance using glossy paper. Some users complained that the pigment inks used on glossy paper made it seem as if they had printed on matte paper. The ink seemed dull and results were washed out, unlike user experiences with every other type of paper. One user commented that while using semi gloss paper, the prints initially looked dull, but after 24 hours were perfectly satisfactory. Users tried many different types of glossy paper, including that sold by Canon, and overall, people printing on glossy paper advised against using it for that purpose.
The other issue that turned up in numerous places was the problem people had printing borderless prints on 13 x 19 inch paper. As set up by Canon, the printer uses 13 x 19 inch paper to make 11 x 14 inch prints - leaving a wide border on all sides. All fine art paper settings had this issue. A number of forum posts had work arounds to allow the 13 x 19 inch paper to be fully printed, but the general feeling was that Canon was trying to force users to have prints with borders when using any of the fine art printer settings on the large format paper.
I called up Canon technical support and found them very helpful. They told me Canon's position on both these issues. Canon, in the user guide, recommends against printing on glossy paper, as the pigment inks do not do well with that paper. An option is the Canon Photo Paper Plus glossy paper, but they don't advise using Canon's regular glossy paper at all with this printer. Technical support also mentioned that the user's manual was online, and interested readers could download it to see Canon's recommendations for use of the printer.
The rep I spoke with also talked to me about the Canon driver set up which did not allow users to print borderless 13 x 19 prints on fine art papers. Prints have a tendency to curl at the ends when printed to the edges on the fine art paper types, and this affects the quality of the print. He suggested that users who wanted borderless prints trim the borders after printing.
Comments indicated low running costs, quiet - but slow - printing, excellent quality prints on all sizes of paper, true to color prints, and once settings were dialed in, a WYSIWYG printer. Users in general were satisfied to very happy with their printer choice.
An ongoing discussion taking place in the forum at dpreview.com has tips, tricks, and notes for owners of Canon Pixma Pro 9500 photo printers. It could be of interest to anyone considering buying the printer and is definitely a useful resource for owners. Among things discussed in the forum was printing on canvas as well as photo paper.