As with all of the Zisc frisbees, my dog loves this one too; yet, she seems especially excited about this one. Unlike another reviewer of this product, I actually use this a lot at night as I often come home late from work. It has been wonderful to be able to see where it is... and where she is when running back toward me (as I try to swipe it from her mouth as she runs by - a little game we play ~smile~).
I actually was impressed at the glow of this Zisc (perhaps the other reviewer should exchange theirs?) though, I did find that it glows bright when you can put it next a lightbulb for a handful of seconds on all sides. It doesn't retain it's brightness for a *long* time (as no product like this does), but I've found it good for about 10 minutes of playtime and then I recharge the Zisc back to full strength brightness if we're going to play more.
I think it's great. You should get one. Your dog will love it (and you'll love it too).