This is my first Vornado purchase. I just found about about this brand from a person in my office. She had a smaller unit, but also a smaller office, and it worked very well on the lowest speed.
This thing is _heavy_. It feels very well constructed, and not at all "chintzy" like the usual $20 fans. On the lowest speed it's amazingly quiet from ~5 feet away.
The only thing I dislike is the noise generated by the middle and high speeds--but that's really rather a non-issue, as it's perfectly capable of circulating the air in an entire 10 x 10 room on the low setting.
As my coworker put it, it's an "air circulator" moreso than a fan; you don't point it directly at you. Rather, angle it somewhere else in the room, from a bit away, and the entire room gets a nice, gentle breeze. I was quite skeptical of this idea, thanks to all the inefficient, cheap fans I've purchased over the years, but this idea WORKS. I stay cooler throughout the day--and my papers aren't constantly blowing off my desk Neat!
Overall I'm very happy with this purchase, and would recommend others to consider this over a cheap fan you'll be replacing in a year once again.
This isn't cheap, but I feel I received very good value for the money spent overall.