I always worry when a new line replaces a known, good, old line of printers. HP has been going downhill for a decade. I'm relieved Lexmark is not cheapening their product line, and in this case "new" means "GOOD."
This seems to be the Lexmark replacement for the 260/360/460 series of printers; I bought an MS610dn as an upgrade to the very good E462dtn last fall and it has been a horse; The MS310d is best suited for a single user with heavy printing needs - specifically our accounting department people - and...
Not a con as much as a feature not paid for - the network interface available on some models; I don't use peer-to-peer print sharing, it's not worth the costly management overhead, so this is a standalone printer for my network