These Neon strings from DR are a great gimmick on a black-light lit stage, and yes, it looks really cool. But the neon finish itself gives the strings a gritty, slow, almost sticky feel. The sound is not as clear defined and ringing as regular strings (the standard DR strings have always been to my liking in this aspect).
Again, it does look cool, so for a rythm (rock) guitar they could still be useful. For solo guitar I would not recommend them, due to the slow feel, and the subpar sound.