The Epson Website for the F Series printers states the warranty is 1 year OR two service visits, whichever comes first. After two visits you would have to purchase a new warranty. Maybe someone can clarify.
If you are using the SublijetE cartridges in the T Series printer, and for some reason Epson doesn't cover the warranty, then Sawgrass will cover that warranty repair for the first year. We have not had any problems with Epson not covering any warranty repairs on the T Series printers.
The SublijetE Cartridges are more expensive than liter options, as they are $320 for 700 milliliters.