I purchased the ab circle pro after watching how promising it looked on tv. I bought it from ebay knowing that with the TV adds you always get charged top dollar. got the maching set it up thinking wow this is great, used it a few times and felt the back of my arms hurting after the work out. after using it for about a week every day I noticed the screws to the bar holding the knee pads would get loose so I would stop my work out and have to do some work to tighten the machine. after working out which I had increased my workout the bar came... read full review »