Anyway, you have to understand that if you want to get lean midsection you should concentrate on your diet fist, and do cardio trainings in order to burn calories and with that fat.
In addition ,there is no need to use any abs exercise equipment since there are many body weight abdominal exercises which are efficient to work and tone your stomach.
On the other hand, there are some fitness equipment for abs which can help a lot. I mean, if you use them you will need to do less reps and sets in order to get the same results as if you do body weight abdominal exercises.
So, if you have some extra money you can spend, there is some equipment which is absolutely worth to buy.
Below I you can find my list of the best fitness equipment for ab workouts.