As far as I can tell these are the best light up/night disc accessory you can get. Thing is you have to destroy a disc for them to work. Assembly means you have to drill four holes in the disc. I went with the color changing Aero Pod ($10). I think they work great. No tape to deal with is my main reason.
Use lighter discs because they add 10 grams to your disc.
With the color changing Aero Pod the clearer the disc the better for the effect that the whole disc will change color.
These are not without flaws. If you hit the bottom of the light directly on something you are likely to turn it off. Also if you thit a tree about 10 feet away from the teepad, that'll turn it off as well. Once they get cold in the less than 50 degree area they will only flash red.