I have been using JR Universal refill kits, both black and colour, on my Epson Stylus 740 for some years now with absolutely no problem. Simply follow the instructions and only use the kits on a stainless steel sink drainer - in case of any spillage.
The newer Epsons do use the chipped refills but JR also produce a resetter for them.
Have a look at jrinkjet.com. It may help you decide.
I'm not sure that Gary necessarily means "refill" as in "put more ink into the existing ink cartridge". After all, we know that some makes of printer are more expensive to run than others - and that i assumed was the point of his question. If that is what you mean, Gary, I'd say Canon ink is cheaper than Epson - it's one of the reasons I would never buy an Epson printer. And I agree with iothers who say use compatible rather than re-filling (in the literal sense): refilling is a messy business but compatibles work fine. though in my experience less fine in Epson than in Canon.
When a cartridge is 'chipped' it means the manufacturer as placed 'a memory chip' into the cartridge. This will then tell the printer all sorts of things, like the cartridge needs replacing, you are using an 'unrecognized' cartridge. All these signals may stop the printer from working. Buying a new manufacturers replacement cartridge, or one that as been re-set correctly, should make the printer work again.
A non chipped cartridge, usually works as standard.
More printer manufacturers are developing their products and cartridges as chipped versions, so as to stop people using compatibles and refilling their own.