It's been a week now since making the transition to working standing up and I can report that I have a love/hate relationship with the setup. Fortunetly, I'm loving it more and hating it less as the days go on and I grow accustomed to standing so much.
The first problem I found was my feet hurt when standing for long periods. This is getting better as time goes on but I do think I need to get a rubber mat to stand on. Also, when my feet get tired, slipping on a pair of shoes really helps.
The next problem I had was my lower back was getting stiff. I think this is probably to be expecteded after working in a sitting position for so many years. Now that my body has been given time to get used to the setup I'm no longer having the back problems.
This weekend I bought a $20 bar stool so I could sit on it or lean against it periodically. This has helped as well. I've found that once I'm on the bar stool I'll only sit for a couple of minutes because I now prefer standing up. But, having the ability to lean back or sit for a couple of minutes really can help.
Something else that really helps is to just move. Kinda dancing back and forth a bit, bouncing on my toes, rocking side to side or even lifting one leg for a while can make it more enjoyable.
I love the fact that while working standing up I move around more and maintain better posture. I'll report back again in another week or so but at this point I think I'll will stick to the new working while standing up format.