The title speaks for itself. I saw the reviews but couldn't understand why they were so negative. I have had several heart rate monitors and several friends have first generation TICKR X. They all love it. I couldn't understand how a reputable company like Wahoo could make a G2 version of a solid product and mess it up so terribly. I was more than wrong. The monitor doesn't stay connected to the device you're syncing to (iPhone, iPad, Peloton, whatever). And when connected, the output is wrong. I won't waste time with a guarantee. Too many people say their replacement monitors are just as bad. I highly recommend staying away from this for at least another six months while they figure out what's wrong with the way they built them. There are much better options on the market that work reliably.
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