Personally, I'm tired of the Firm's endless array of equipment that is used in just a few workouts, and never again (ie: the Transfirmer, which was a great idea, IMO, but never had any more than the original workouts made for it).
I'd say, if you don't already have a lot of equipment (I do!), think it looks like fun (and don't mind never having more than the 5 or whatever workouts it comes with) and have the cash to spare, go for it!