They'll both get the update. An M3 with the BS/RDR update will outperform one without it.
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Right, but you're testing the reactivity of the detector with quick shots, where the V1 crushes the RedLine. Where the RedLine shines is sensitivity, so there is a window where the V1 won't detect what a RedLine will. From my experience, these type of encounters are more prevelant, at least in my area. Also, the V1 is known to park of a frequency for a while, after it detects an I/O shot. You have to wait at least 10 seconds in between shots when testing a V1.
I'm referring to the difference in sensitivity. There are signals that the RedLine can detect, that are too weak for the V1 to detect, because of the difference in sensitivity between the two units. Here's a couple of examples.
http://www.youtube.com/watch?v=YkP8XL0fOY8
http://www.youtube.com/watch?v=jve_2cxDMpo