Depends on how motivated you are, and if there's a local climbing gym that you and/or your friends usually attend. In DFA's experience, most home walls are met with an initial outpouring of stoke, but enthusiasm usually dwindles as people get back to their more usual, more convenient, gym routine. If you've got a motivated posse, though, without other training options or gym commitments, the home gym could kick ass.
Give it a good honest assessment, is all. If you don't think you'd get tons of use out of it, just think how far the hundreds or thousands you'd spend on the home wall could get you on a road trip. Cha-ching!