Hi CacheExtraordinaire,
Wow that's quite neat, having geocachers record their impressions on the cache is a nice idea, you could even putting some online with a link on the cache page later on. Actually I found an old portable CD player at home so I started modifying it to have an external battery and making it look more used than it is. I would be worried about keeping a battey in the cache though as it is supposed to rust quite easily. Also can you tell me whether it is a premium only cache ? Thanks for nice info !