Doble lado PRECISION 3+ PRO Medidore de potencia

the sensor came unstuck after only 9 months of use

Spider appears to have been bent slightly and inner chainring rubs on derailleur. Can’t replace bent part so now it is nonfunctional. Very delicate and I’m disappointed.

Precision pro 3+ (pre-install) on Dura-Ace. Power meter is accurate and battery life is as expected. Problem? Really flimsy poorly designed non-designed driver side batter cap. Any battery change results in poor contact due to cap design. 4iiii's compliance with US Reese's Law (child safety for battery) made it worse. Would have been a 5 * if not for non-driver side batter cap constantly giving me issues.

Bought 4iiii Precision 3+ Pro Dual Ultegra FC-R8100 Power Meter Chainset in June. Non drive side goes through batteries. Even when not in use it still drains the battery even though it is asleep. When first bought had connection issues. Then batteries. Now sent back and awaiting results. A lot of money spent on this and hardly used. Looking at reviews loads of people have the same problem. Even GP lama on his YouTube channel has said he doesn’t have faith in the dura ace one. Considering this is a known problem I’m surprised that nothing has been done to rectify it. Just hope when I get mine back or a swap out unit that it works. Otherwise it’s going to be returned again and refunded. Not holding my breath that it’s going to work. Very disappointed and wish I had done my research before splashing my money out on this product. Would never have bought it otherwise and definitely won’t recommend it unfortunately. Customer service has been great. But that’s it.

Finally dicided to write a review after 16 months of using a double sided power meter which was installed at factory on a new Dura Ace cranks. Shipment was good and it took about two weeks to get it back. First of all, batteries don't last more than 50 hours, I believe they advertise 800 hours. Secondly, connectivity to my head unit is hit and miss. Very often I have to remove devices in 4iiii app and add them again in order to connect to the head unit. Between battery and connectivity issues most of the times I end up riding without power meter and cadence. Generally, I am very disappointed, it was a waste of money.