I bought this double set for my Epson DX8450 printer, so I have only tried the pack with this model.
When I installed the cartridges, the printer believed them to be the Real Epson ones.
I did need to run the printer through the head alignments twice and re-clean the printer heads, but after that the inks look very good and the pages came out correctly.
My only worry is will they last as long as the official ones? Of course the real Epson TO715 4 Pack, still costs around £24.00 (in 2008) and this 8 pack from Moreinks costs £12.00.
So at least the good news is, they're roughly 75% cheaper!