Top critical review
I would not recommend purchasing the DN model
on January 8, 2016
I would not recommend purchasing the DN model. The printer appears to print correctly in single sided mode. It has firmware/driver issues sometimes printing double sided. Their own user manual for the printer (PDF) incorrectly printed the 4th page (unusable, it looks like the print scaled up 200-300 % and went off the edges of the page). It just printed an Outlook 2010 email (14 pages) with a similar mistake except this time it errored out with "firmware 900.52". I have owned the printer for about 1 month. I have loaded the drivers that came on the CD, both PCL and Postscript drivers from the website and spent over an hour online with Lexmark support where they took control of one of my computers and tried to fix the problem. This occurs on 3 computers. Two are Win 7 Ultimate (64bit) and the third is Win 8.1 (64bit). I have printed the same documents on a Xerox Phaser 6180 without any problem, immediately after getting the problem with the Lexmark from the same open document.
3/8/2016 Update. I just downloaded the latest firmware, EC6.0 base=LW60.PR2.P632 and print drivers. Lexmark has not fixed the two sided print problem yet.
I have added pictures of what a good print (done in single sided more) and bad print look like (2 sided mode).
Bottom line: Lexmark needs to fix their firmware. I have downloaded the latest printer firmware from Lexmark's website and upgraded the printer as part of the process. All 3 computers are set to automatically update the Microsoft software and I have manually verified that they were fully updated.