The Océ machines (like the Titan 6000 and DT135) are extremely well made (except the cheap Canon finishers on the DT135), however, it's important to factor in the limited earning potential from not being able to produce over-printed work. This is a significant proportion of mono volume. The supreme reliability comes from a simpler technology and a much lower fusing temperature. Less heat equals less problems with curling, jams, no need for cooling technology etc. At my company, we would recommend the Ricoh 8000 or 2 x 80ppm Kyocera boxes (for redundancy). These are cheaper (important in a declining market) but have more earning potential for over-printing, books and booklet work. The Xerox Nuvera is long in the tooth with a 1990s-design, has limited 300gsm+ capability, slows badly on SRA3 and won't fuse coated stocks at all well. It's over-priced (a refurbished 'Source' Nuvera costs more than brand new Ricoh) and suffers from static too, with printed sheets sticking together. Xerox have long since decided that mono is old-tech and have switched R&D towards newer technologies. The R&D budget going into mono is about zilch. However, it's a real workhorse and Xerox service is still the benchmark. The KM are good too but with a lower image quality than the others. That said, they have impressive specifications with multiple finishing options. Hope this helps. Best of luck to you. There's no bad machines, just one's that aren't fit for your intended purpose.