Overall this is a valiant step into the handheld world of rhythm action games from Activision. The fret peripheral is well built and certainly adds plenty of novelty interest to the game. The bottom line however, is that there are other simpler better rhythm games already available on the DS.
Elite Beat Agents for instance provides a much more suitable experience to the platform - largely because it doesn't constrain itself to one control metaphor. Guitar Hero on Tour is hampered by its franchise being so enmeshed with the guitar controller that simply doesn't fit well on the DS.