Garmin 2828
I would say go with the Garmin and save yourself a whole lot of money. I'm currently running the 2610 on my GS and absolutely love it. I will up-grade to the 2820 to use the blue tooth function which I already have for my helmet (Nolan N102) so I can get rid of the wire I currenlty use to get the voice prompts and be completely wireless.
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