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i've heard they suck. bad quality, poor range, stuff like that. just over-hyped junk. not something i'd buy.
i'd probably go with some of those tiny ccd's or something. they work well in the dark as well, a lot of them have IR illuminators and stuff. you can get them the size of about a quarter on up. they're pretty cheap, but you have to adapt a signal system/carrier for them. you can go wired or add a wireless transciever. of course, you can get more expensive stuff with higher quality, really nice mounting systems and excellent illuminators for around $150-200/ea. i can dig up some references probably if you're interested.
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