Their system works this way:
- Power meter is set to disable itself every 30 days (only cadence is broadcasted)
- By paying 1 month of membership you push these 30 days back
- After 2 years it stops doing that.
But a few months ago they offered a small discount to all who paid their remaining fee and got rid of subscription model. Those who paid got their power meters unlocked.
My take: Zhimanox is working fine for me, but I sent it to Denmark twice to fix cracked cover. In the first case it caused signal dropouts. I had no other issues.
I suggest sending an email to hello@teamzwatt.com to clarify how much should you pay to unlock if fully. It might be less than original fee. The original owner might not understand correctly how their subscription system works. Once you get the answer from Team ZWATT you could see the total price.
There is an issue with very limited support available as Zhimanox is discontinued.