I've already got a Kangaroo Elite, and I use it 6-plus hours per day, five days a week... only sit down for lunch... :-) There was NO transition or break-in period. I went from sitting all day to standing all day within two days after receiving my Kangaroo. No pain, no strain. Easy-peasy. It's helping my back, and I'm much more alert. I even stand at meetings now, just to maintain my edge... and stay awake.