I was going to buy one of the gypsy sit upon but I found at Meijer the same thing in the exercise aisle and it is made by "The Firm" for $15. Someone else found one at Walmart made by Danskin. I sit on mine all the time and I don't have any lower back aches. I did find at first that I was sore in my sides but that is because it is making me use my core muscles to sit up straight (which is a good thing!) Oh and I have just adjustable task chair from Office Depot.