When I sit at my computer for more than an hour at a time, I am VERY stiff when I get up. When I first got it, I did not think it would do much good, but the more frequently I use it, the more good it does.
When I first got it, I raised up my computer station once in midmorning and once mid-afternoon. Now, I raise it once an hour for 10 minutes and I feel better throughout the day.
No claim here that there is scientific data re: health benefits. I just am less stiff on days when I stand up for 10 to 15 minutes every hour.
There are over a dozen manufacturers that vary in price.