With broadband getting faster and faster, as well as my sources being reliable and fast, it made the decision of not backing up the majority of my files using RAID an easy choice. It's not for everyone though
The Synology software (DSM) is pretty much identical between all of their products, so if one product has print server capabilities, the others will. Could be they just missed it out in the description you saw. DSM 5 was recently released which gave all the new features to all their products which could take the update. Some of their older products, say 4 years and older for example, would be stuck on 4.3 or something like that but even then, they should all have pretty much the same capabilities but different specs and speed.