I applaud the OP for doing what he said he was going to do nine months ago (I assume modmypin belongs to him):
http://pinside.com/pinball/forum/topic/new-glow-in-the-dark-pinballs/page/2#post-1166233
A lot of people don't like VND because of the glos, specifically that the balls are "too bouncy," or "too slow." This is due to the fact that they weigh 3/4ths that of a regular pinball. A lot of people put regular balls in their VND because it offers a higher level of control:
Quoted from BLACK_ROSE:I Preferred play-n the pin w/ the Reg Metal ball's load'd in.. The Glow ball's were tooo slow..
Recognizing that the machine plays differently with these types of balls is important:
Quoted from goatdan:I doubt I'll use them in too many other things - the difference in ball weight really does make them play differently - but I am stoked to get some for VND!
As I said to the OP nine months ago I will definitely get a couple sets of glos. I'll also probably get some fluorescents to have in a few other games for parties and such. I wish him the best of luck.
viperrwk