Glider Discs?

ace175

Hello! I was wondering if anyone has used glider discs when working out? I've seen a few things on tv about using them as a work out, but was just wondering if anyone here has used them/recommends a specific kind of them? I searched on two sporting goods stores' websites, but found nothing. I did find this website though http://www.power-systems.com/showproduct.aspx?ProductID=4117&SEName=gliding-discs

If anyone has any info, please let me know!

Thank you so much in advance!