Looks bogus to me, as do all specialized ab devices. They only do one thing, and are usually way overpriced, IMO. If you notice, they compare the "jackknife" (the most difficult and advanced move you can do on this glorified lounge chair) to regular crunches. So that may be the only challenging move.
For neck support, try putting a folded towel behind your neck or head and grabbing on to the ends. Cradle your head in the towel and be sure to pull up through your chest, letting your arms (which are "attached" to the towel) come along for the ride, rather than pulling with your arms. This can help quite a bit.
Also do a "look to the right...look to the left" neck stretch after every set of ab work, to help loosen the muscles in that area.