We used third party inks in a Mimaki JV3, after having stuck with OEM for a couple of years past the warranty. We enjoyed the lower price, and with the particular supplier we used the conversion was simple--the inks were compatible with the OEM so we didn't have to throw out all our ink and switch them all at the same time. Everything went along fine for a few years until we had a head failure with the cyan ink. We replaced it (paying a technician to do it) and then it failed again less than 2 weeks later. Paid the technician to come out again and replace it, and the same thing happened in a week. Replaced it myself, (I'd learned how by then) and again, a week later it failed. After two months of spending money fixing the printer and having almost no production, I bought a new printer (that we still have now, over 5 years later). About 6 months later I got a bulletin from the ink manufacturer that they had identified a problem with their cyan ink and if I returned ink cartridges from certain lot numbers they'd send me new ink cartridges. An 80 dollar ink cartridge is no recompense for thousands in repair cost and tens of thousands in lost business.
With our new machine we pay OEM prices for OEM ink.