We run a small print shop with several enterprise level printers, and have been using the old M602s, which we have loved, but they are finally giving up the ghost. We replaced 2 of them with M611s, and could not be more pleased with their performance. SUPER FAST. We've been using them for 2 months now with no complaints. Plan to buy 2 more this summer as funds permit.
Printer printed 3 pages before malfunctioning. HP sent a tech to fix and he needs other parts to fix. The printer does not work and waiting for a fix from HP. I don't know why they are not replacing the faulty printer!