The magnets are inexpensive, I learned of them through one of the inventores of the Polar power meter, he helped me install mine in his garage and threw the Polar magnet in the trash--here's some examples:<br><br><a href="http://www.rare-earth-magnets.com/SearchResult-CategoryID-34.html" target="_blank">http://www.rare-earth-magnets.com/Se...goryID-34.html</a><br><br>
I don't like trying to figure out the more advanced Polar products, I don't like their use interface or directions, though the products do seem to be well made.<br><br>
I got sick of having cadence, it worked infrequently and I was always fiddling with it while I should have been riding. If you are a gear masher, though, it will make you aware of what 90 rpm's feel like. I found that after riding for so long, my cadence was fine.