Breakage 
I have spoken with my R2 regarding these in the past here is my knowledge of information gleaned:
Boards inside are midgrade to high grade boards (I've seen some nice ones and some really cheap-o ones) but they are small and are about the weight equivalent of a laptop hard drive board (although they won't give you THAT price for them.)
The screens: I'd pay money to see someone get one off without cracking it. I've tried I don't know how many ways- and have never accomplished that feat.
The batteries contained within are stuck into the unit with some type of gorilla/NASA space aged sticky substance that will render it worthless if it isn't swollen.
If you can sell them whole and get something out of them: That is what I would do personally. Scrap in them is minimal at best. Probably 90% of it ends up in the trash as it is about 90% glass and plastic.
If anyone has any better tips or ways to maximize these.. I'm all ears.
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