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@Dammit
I use a couple of different ANT+ speed sensors- one is a Bontrager unit, which once you have thrown the crap rubber band it comes with in the bin and zip-tied it in place works very well, the other is a unit that SRM re-brands and it also is very reliable.
The second unit can be found with quite a few different brand names printed on it, but the unit shape is quite distinctive.