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Well, basically, you don't have to get in to get your discs. But, they only work well to get them out fi you can see them.
You can retrieve other discs that you didn't lose with it, but be prepared to be using it for a pretty long time
I had the Quic Stic, it worked pretty well for 2 years, saved 40-50 discs, then snapped when I stuck it in a fast moving creek, and it was thick aluminum.