It's rather exciting to see how far the Kickstarter sphere can reach! Thanks for sharing!
As a father with a young daughter, I'm definitely cognizant of the potential for small objects getting swallowed, so I took great consideration into the design of each molded piece.
Silicone is a fascinating material to develop with because it has so many incredibly unique properties. When the magnets are embedded into each design, the tension and friction are very snug. It also creates an air tight seal against the backside of the grid/gel slot (since it has a covering on one side), and this creates pressure to prevent it from accidental, and even intentional, removal from the silicone. You have to really work at removing the magnets from the grid, and if you wanted to remove them from the grip, well, you might even damage it.
As for magnets + electronics...I've been using strong rare earth magnets since 2008. In 2009 I moved into my commercial studio space, and even used them to mount large portraits to the wall, so I could swap between wedding/seniors/families with ease depending on which type of customer was coming by. I haven't in 4 years had a single negative experience with magnets, and I'd say I'm fairly carefree when it comes to keeping my gear managed and organized. I always have cameras, flashes, and lenses strewn about my work tables, and there were always magnets around.
It's a pretty common misconception that magnets are like the black plague when it comes to cameras, which is why I tried to address the potential fears in a video posted on the Kickstarter page. But even still, I'm sure some will still be wary of the idea, but to each his own.
Just thought I'd chime in, say hello, and finally join the forum...always love seeing CR pop up in my RSS