There are many pieces of abdominal exercise equipment on the market. Abs exercise equipment will not reduce fat on your stomach as often advertised by many brands but the better ab exercise equipment really helps tone and strengthen your stomach.
The range of abdominal exercise equipment varies in quality. The Ab slide is very similar to the ab dolly, ab force and torso tiger. It is well known due to heavy advertisement. The ab slide is one of the first ab machines to deploy the "sliding bodyweight?" method but this method has been reported to increase backache during and after exercise.
The Ab away pro has glowing references. It provides a comfortable and natural movement. You will feel the strain in your abdomen rather than on your neck and back. There are cheaper versions of the Ab Away Pro such as the Ab Doer and the Ab twister but it's worth paying that little bit extra for the quality of the Ab Away pro.