No, I haven't tried Image Specialists inks, although I know some of the Canon guys like I.S. inks for Canon. Image Specialists markets inks for most all of the popular inkjet printers.
I am extremely happy with Hobbicolors inks for my Canons. Hobbicolors markets inks for Canon printers only.
If I couldn't get Hobbicolors, I'm sure that I would be equally happy with Image Specialists.
It is important to note that Epson inks and Canon inks are not interchangeable.