This is my second Lexmark monochrome laser printer, replacing an E260. It's much, much faster, the print quality is excellent, and it has a sleep mode. I highly recommend it.
Cons: Features, Set up, Does Not Meet Expectations, incomplete package
This printer tries to do too much. As a result it is too complicated. Initially it refused to wake up when it had been asleep for a few hours. A lengthy conversation with tech service in which its software was updated seemed to solve the problem but it still won't respond to commands from the second computer on our home network. It came without a cable to connect it to my computer; I had to steal one from another system and will have to purchase a new one soon.
Once it's up and running it seems to be a good printer. Print quality is great and speed is adequate for a small medical office.
Annoyed with set-up because user manual states this model has wireless capability if you buy a specific adapter (which I bought) but when I got it in the mail and tried to attach it, it attaches with a USB port, which the printer does not have. I called tech support and was informed that the MS310d does NOT have wireless adaptability but the MS310dn does. So instead of using it wirelessly like I had preferred we decided to keep it and use it via a direct (wired) connection to the computer EXCEPT the cord to connect it to the printer wasn't included in the box/package. ANNOYING!
But, if you have the cord and want it connected directly to your computer, set-up was simple.