"With any sedentary similiar to mine, calorie burn rates are pretty low. Given that weight goes on easy and prevention of weight gain was almost impossible just by limiting calories for me. This desk has been the breakthrough for this problem TrekDesk has allowed me to walk at a rate of 2 mph for up to 3 to 5 hours a day when in my office and burn over a 1000 cals per day and log well over 20000 steps per day. It does not hamper work productivity.On items that require a lot of heavy duty concentration, I have found that sitting might be better than trying to walk at my 2 mph rate ( I haven't been able to convince myself to walk at .5 mph where I might be able to concentrate more effectively). But checking email, regular mail, writing simple reports, performing basic office stuff, etc. the desk has not been a constraint. Phone calls are a easy as well.The desk comes unassembled. If you're somewhat handy, assembly is not a problem. Some might need some help even though the instructions are good.Overall it's a breakthrough item for me to overcome the health risks associated with my sedentary occupation."