Though I do not own an Epson printer (always had HP), I've had my experiences with these "compats". The experiences vary quite. When it comes to the black ink, most compats are pretty good, although some give a slightly lesser quality. The color ink I've used really shows differences between the original and the compats: colors aren't as they should be and they bleed more than they should. For both black and color ink goes that compats often aren't as waterproof as the originals.
My conclusion is that compats can be a good solution, depending on what you have to use your printer for. If you don't need state-of-the-art printing quality or just print scraps, compats are fine. If you do need the higher quality, the real ink might be the better choice. At least, that's my experience with HP compats and originals.