I used them to upgrade the Keizer M3 to use Zwift and they were excellent. Very solidly made, 100% reliable so far (1 month of use), easy to install (although you will need a separate adjustable torque wrench to follow directions closely), long battery life and very durable, withstands a fair amount of abuse from my 230lbs up now no problem. Also easily rechargeable and easy to switch to another bike/trainer. A bit pricey but as they say you get what you pay for and I think it's better to spend more to get this quality than not. Update: After 1 year of use they remain reliable with no misfires or other issues if they don't go out. on juice. Speaking of which, if they're used 3-4 times a week for 1 hour per session, they seem to need to be charged once a month or so, which is pretty easy. Excellent purchase.
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