Ab Hits DVD does indeed have core work, including the CTX Kickbox ab routine, the CTX Power Circuit ab routine, the Slow and Heavy plank and superman routine, the Power Hour ab routine (I'm not sure if the VHS version has Power Hour). It also has the Slow and Heavy traditional abs routine, which incorporates even more long-lever work.
And yes you should get it; get the DVD if you have the equipment, but the VHS version is good as well.
A-jock