I have the ab twister and the balance board and love both of those but here are some other good options as well.
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Equipment
I absolutely love this product! It's fun, quiet, and doesn't require a lot of space. Take it with you anywhere. It also has a digital counter. It tells you how much calories you burn and things like that. The arm bands are very good quality too.
MERACH Slide Steppers with Bands & LCD Monitor
I don't have this one, but I know people that do and they love it. It is a bit more challenging, but the results are worth it.
MERACH Adjustable Foldable Ab Trainer Machine
I don't have this, but I know people that do and they live it. Its easier for people to be able to work out that have bad backs or knees. You will be able to workout and not strain as much.
MERACH Adjustable Deep Squat Machine for Women
This definitely helps out many that can't do the exercise the old fashion way. This makes it easier and you still get the results that you want without having to hurt yourself to do it.
MERACH Ab Machine with 3 Resistance & 330LBS
This is a bit more challenging and takes up more space but very easy to store. The results are worth it.
MERACH Vertical Climber Stepper for Home Gym
I love this. It's easy, fun, doesn't strain any muscles, and doesn't take up a lot of space.