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Interested to hear experiences of anyone that has one. I've just ordered one as it was the only option I could find available any time soon. It will be used with my MTB so looking forward to seeing what the off road options on Zwift are like
I've got a Whisperdrive which is the precursor to the Volt. I'm not sure if they share anything in common but the Whisperdrive has been.... okay. I've had to take it to bits twice because it's started making an absolutely horrific noise, pop the seals off the bearings and regrease them. It gets a lot of use though.
Can't comment on the power estimation aspect as I don't use it for that (though I do have the doodah fitted).
My friend already has this. He is delighted with them. Good. If you want to buy, go ahead.