Hi Andy,
In the past I sent my AZEQ6 to the US for Hypertune service that included replacing bearings with ceramic ones. While it was somehow reassuring that grease, bearings etc have been looked at, cleaned and adjusted, I did not notice a significant difference in my mount's performance before and after Hyper-tuning. I was already getting pretty good performance from my mount before the service (for a mass produced mount) and was hoping that perhaps hyper tuning will take it to another level, but it did not. I'm quite confident though that hyper-tuning will help with longevity of the mount. So I would not personally recommend upgrading the bearings. Replacing stock grease with quality lubricant is a great idea for sure
