Not durable
I use this as my backup.  I have used it perhaps six times since buying it 5 weeks ago.  While the construction seems decent, the rubber/plastic tread on the wheels has cracked.  The wheel also feels unstable when rolling.  This is good and bad.  The instability stresses the abs more.  A beginner would find this wheel harder than other a more stable wheel to use.  I use wheels regularly as they are one of the best ab exercises, so I have experience a fair number of these devices.  If the tread were more durable I would rate it higher.  While this could be an isolated case, I would advise others to buy other products based on my experience with this one.
Rating: 1 stars