Summary: Gets pretty heavy use and has printed solidly. We print documents that go to clients so we need very clear printing. No MICR or checks. The only issue we have is the same issue we have with all HP's. And that is that it drops off the network periodically, so jobs stack up in the queue. Not really hard to fix, but it gets annoying. Brother doesn't seem to have that problem, but I haven't found them to be as durable as the HPs.
Excerpt: the new work horse in the office, taking all projects with reckless abandon if you are looking for a 25/8 (one more than 24 hours 7 days week) printer then this is it. Can't hear enough praises from staff on its speed and lack of noise. and so you must know its in our accounting dept where they send out 1000's of checks and statements weekly.
Summary: My organization purchased 2 of these printers and have now been using them for approx. 6 months. So far we have had very good results from these printers. They seem to be fast, responsive, and they haven't been using toner nearly as quickly as the 10 year old units they replaced. The printers are used in a retail environment for printing invoices and pick lists, with an average ink coverage of approx. 2%.
Summary: We have used many laser printers over the years for production of our published forms. Our previous favorite, an HP LaserJet 5si, has been bumped to second favored with the addition of this LJ M603 with five-bin mailbox/stacker. (The LJ 5si gives us large-format capabilities, so we still use it even after 16 years in service.) The M603DN will replace two other HP printers with its twice the page-per-minute print speed.