I also moved to a standing desk about two months ago. I already had a rather narrow shelf cabinet whose top was used for the printer. I moved the printer down to the regular desk and the monitor up there.

I started this set up as an experiment to see if standing will work for me. And thus far I love it very much. If I were to write an article myself, it would be quite similar to Leo's. I don't track my weight as I'm not overweight but I agree about the focus effect and the general "more energy to work" benefit. Standing has eliminated the post-lunch heaviness that I used to experience, especially when I was working in a corporate environment, before going indie, working at home.

So far I had no negative impacts, except temporal lower back pain while I adjusted in the first couple of weeks and occasional sore feet. On the other hand, I believe I had several benefits, related to the occasional back and neck pain which is often the result of sitting. Plus the increased energy, like I wrote previously.

My verdict, I recommend everyone at least to try it as an experiment for a month or so and see if it works for you.