Summary: I installed this printer a year ago at a non-profit I work for. It has a couple of gotchas, which caused us massive grief for a few months. If you print via the Internet Printing Protocol (IPP), the printer will crash periodically on seemingly random jobs.
Summary: Comments about Lexmark T640tn: This printer didn't float my point. I'm not sure if it is my computer or the printer, but the PPM was terribly slow. I can't work with this printer. I would NOT recommend any purchase this printer. On top of it being pricey, it is slow and noisy.