I have had a Pro100 now for about 3 years, the only problems I have had is the wifi connection keeps dropping out. When it first happened I emailed canon and found them very helpful, if it drops out now I just connect with a cable, do the print, take the cable out and the next time I want the printer it works by wifi okay.
On the subject of inks I buy mine from " Incredible inks .com", and have never had a problem with them. They are compatible and I had a full set delivered last week for £24 plus coppers.