I've been a home-based employee for 3 1/2 years now, and previously had been using HP printers in my home office... first the Deskjet 6940dt, then the Officejet Pro 8000. Both were dual-tray, auto-duplex units and had their pros and cons. The 6940 was not a robust machine, with limited ink and paper capacity, and slow speed. The 8000 was very cranky at times, rebooting (which takes a good 2-3 minutes) after every power blip or after several heavy jobs.
After 10 years in total of HP printers at home, I decided to look elsewhere. The Canon Pixma iP4920 had plenty of features, but Canon considered it a photo/consumer printer, so the business use I frequently need would overpower it. The Ricoh Aficio GX series GelSprinters had the heavy duty function I wanted, but the resolution was pretty low in comparison to others, and I do print the occasional photograph from my digital camera.
Then I came across the Epson B-510DN. While the most expensive of those I was looking at, this printer not only did everything I wanted, but offered a few major advantages. The B-510DN is incredibly quick, even for duplex printing. And speaking of the duplex, you can print both sides on legal as well as letter with the Epson. The ink yield is above expectations - the standard cartridges have outstanding capacity - 3000 (black) and 3500 (cyan, yellow, magenta) pages... much more cost effective compared with the extra-large cartridges of the HP 8000 (2200 pages black, 1400 for the three colors). And with 5760x1440 resolution, the B-510DN printed a 12MP digital photo notably cleaner and sharper than the 4800x1200 HP.
Installation on Windows 7 x64 was quick and easy - unlike the 20 minute "initialization" the HP 8000 required out of the box. In the first day of ownership, I printed several two-sided documents on both letter and legal, 4x6 photos, and other jobs right away with no issues.
Again, this is an expensive printer, but if you can swing the price, you won't be disappointed with the performance! This is my first Epson since a 1999 Photo 600 inkjet, but likely won't take as long to buy another Epson in the future.