I'd try it, if I could rent the stuff for a week. Last week, I did as much work as I could, standing with my laptop on a counter. One day, I just couldn't sit still any more.
It was OK for data entry, reading and such. But to do stuff that required complete concentration, I had to sit down and use the big workstation. (Also, for security reasons, financial stuff can't be done on my laptop.)
In a weird way, the treadmill seems like it might be easier than just standing there for any length of time.