Pros: Fast, good color & excellent B/W printing. Easy set up (NOT GOOD FOR MAC OSX LION!!)
Cons: Epson/Apple need to play ball better. Right now, if you bought an Apple with Lion pre-installed, don't bother with this printer. If you're upgrading, make sure it all works BEFORE you update and then keep your fingers crossed!
Cons: Frustrating Lion support. I nearly packed this up and took it back to staples too (as the other review states). However, I called them and they were able to walk me through a kludgey process--but it works!
Summary: The major factors that contributed to my decision to buy Epson WorkForce 635 was its two-sided printing capability, multitude of connectivity options (USB, Ethernet, and Wi-Fi b/g/n) and alleged fast printing capabilities. After using my new printer for several days I can attest that Epson WorkForce 635 is a decent multi-function printer/scanner/copier/fax as long as you stick to mostly black-and-white documents.
Pros: Easy Setup, Easy To Use, Fast Operation, Multitude of connectivity, Two-sided printing
Cons: Confusing driver updates, Poor scanner and copier