Originally Posted by Atlas Shrugged

Have no fear, 9100 series Di2 has been running smoothly for over seven years and that the 9000 series has been reliable for 12 years. This kind of track record is indeed reassuring for users, indicating that the technology has proven to be durable and dependable over an extended period.

Electronic shifting systems, like Shimano's Di2, have received positive feedback for their precision, responsiveness, and overall performance. As with any technology, occasional issues may arise, but it seems that the 9100 and 9000 series have demonstrated a high level of reliability.