Summary: I've just always been partial to HP printers from the old school days when their drivers always worked better than other printer manufacturers across VPNs, etc. You might find a comparable printer that does as good of a job for less money.
Pros: I have two M601s and two M603s. the M603 can use the 90X toner (high capacity). Prints fast; high volume/enterprise class.
Cons: The 90X toner lifespan isn't as good per page as the 90A (not worth the extra money). Maintenance kit for M601 is pricey, which is prolly same maintenance kit for M603. BIGGEST ISSUE: Drivers on disk had print issue (20 sec delays) with Win7 64 AND Win8.1 64 (printing 64bit from 32bit apps such a...
Pros: We first ordered the 601N for our office and after seeing the speed of printing, the 601N was moved to our other office and we ordered the 603N. The delivery time was what was amazing. One day after we ordered them, we received them.
Cons: The 603 came with the regular 90A toner cartridge which seemed to go pretty quickly. We have just recently installed the 90X, so we will see how long that lasts.
Summary: 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.
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.