I have one that raises and lowers, I wouldn't want a pure standing desk. The hydraulic ones aren't cheap, though.
It was a cheap arm and a cheap desk. A cheap desk with a better arm might have turned out better. I am kind of wishing I had looked at a few more desks, but I worked things out by shimming the monitor arm and putting 110 pounds of lead on the desk to stabilize it. I hope that doesn't burn the motor out!
The sit/stand functionality works well. If you go to Ikea you can see one in person in the US. Their stock info was wrong when I went and they didn't have the regular desk only the corner desk which was 100$ more.
The secret is definitely that it should be adjustable, that is you should be able to vary between sitting and standing. I switch about 4 to 5 times per day.
It's glaringly obvious that you're not supposed to stand and work the whole day. I don't understand how the author of the linked post (and many other "standing desks suck" articles) didn't realize this.