Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Junk

The first day I had this product, I used it for about 20 min. when I had to stop due to the smell of burning rubber. This is the smell of the internal seals of the pneumatic tubes beginning to melt. The device simply cannot withstand 20 minutes of use due to heating of the tubes. After that I kept my workouts to only 15 minutes. This is not enough for a cardio workout, but as part of bigger routine it's ok. After 2 weeks of using it 2-3 times each week for 15 minutes, the step counter/timer broke. So I began timing my workout with the clock. Now after less than 3 months of use, the cable is so stretched out and the resistance so low that it is ready for the dumpster. I weight 155 lbs, so I'm well below the maximum weight for this unit. Denise should be ashamed of herself!