Their desks are totally functional, but they're not fancy. So when I started to build my desk I decided I would make mine FANCY.
A few quick trips to Ikea, a sports store, and a Lowe's Depot gave me the foundation I needed to make a fully integrated treadmill desk.
I've had this desk since March of 2010 and after the initial adjustment period, during which walking was torture and standing was something I did for emergencies, I can now say that it's solely responsible for all the happiness I've ever had. Seriously, I'm never tired anymore. I can walk around the mall, the World Maker Faire, go to the gym, and I'm NEVER tired.
My energy level is somewhere between normal, natural human and freakish mitochondrial mutation. It's totally awesome.
So if you can stand the 1-3 week adjustment period you can reverse the years of damage from sitting 8 hours a day year after year after year. The trick is to fully commit. I work remotely and I put my imac on the treadmill desk. Now, if I'm working I'm walking.