Beware that canvas also reduces the working life of any blade (makes them dull faster).
Sure but they're easy to replace. I've been using the original cutter on my iPF9000 (upgraded to a 9100) for years and it's still going strong.
Because I travel around ~4 days a week working with clients on their own printers, I've cut canvas on a ton of printers. And I'll say that the cutting mechanisms are not consistent. Some printers do this well, others just don't - even when they are new. This is especially true with the iPF printers. If you buy 3 replacement cutter blades one might work well and the other two likely won't. I suspect it has something to do with the spring that pops the blade into position. I really like it that Epson has follewed Canon's lead and switched to a rotary blade with a superior design.