So all I can say on the original Canon cartridges is really reliable! I recently want to change my MX-320 the black cartridge and a purely done by the low-compatible - but I could do what I wanted, nothing stirred more .... possibly empty through a few months storage? Well - I then ordered the same at Amazon Canon original cartridge PG-510, the consignment was after 2 days with me. The Canon cartridge used - only once a trial print - and whoops - everything worked perfectly again! The price is right, too on Amazon. What do you want (s) more ... I will not be unfaithful in future ;-) Full marks from me.
Update 20/10/2014:
After 1 year of operation this (black) cartridge is still in use (the color I have now replaced). No problems with dry od. Similar. Furthermore, my full recommendation!
I would be glad if my contribution was somewhat helpful to you.
Update 02/09/2015:
In January 2015, the black cartridge has reviewed on the last drop of output and I replaced it. She has so far done its job more than 1 year to my complete satisfaction. Absolutely Exquisite!