Unless you have an issue with the unit, I see no reason to automatically spend the time and money to do this. I have at least a half dozen Spectrophotometer's (going back to a Spectrolino), they work fine and only my DTP-41UV/T had to go to X-Rite due to what appeared to be an issue (ended up being the buggy ColorPort not the unit). If the Spectrophotometer's calibrate fine, or don't pop errors with the software diagnostics, I see no reason to send em in.