ucmj22 - this thread got my attention because it had switching ink in the titled. But that's not why I'm replying. I see you are in Herrin, IL? I grew up just outside Benton. My immediate family is still there. I don't run into too many shops in good old Southern Illinois (and by "southern" I don't mean south of Kankakee).
I wouldn't be doing my job if I didn't mention checking out Lyson inks from Nazdar.
By the way, I am confused. You said you are using a 16 month old Mimaki JV3, but then you talk about the $40 savings per cartridge from your "Roland brand"??? Does your JV3 have a 12 month or 24 month warranty? Is it a JV3 or JV33? Did you buy it new or used?
Not only would I recommend Roland OEM for the balance of the warranty, but I would suggest a warranty visit/check up prior to the warranty expiration. This gives you peace of mind that the XC540 is operating according to factory specs/warranty before the warranty expires.