If you have a MacBook Pro Retina from 2013 or 2014, we would currently advise you to wait with Upate to macOS 11 Big Sur. In the worst case your MacBook may become unusable.
We have described here that Big Sur makes a pretty good impression so far. However, this seems to be true only if the installation goes smoothly. And it does not necessarily do so with the devices mentioned. Many users report in the Apple Forums or on reddit that affected devices simply won’t start after a failed installation attempt. All startup attempts with exiting reset attempts fail. A call to Apple apparently confirms that the problem is serious: You should contact an Apple service partner.
It seems that a faulty firmware update during the installation is probably to blame. However, it does not occur on all machines. Nevertheless, there are machines that perform the Big Sur installation, but then show a very slow boot process. Apple has no comment on this so far.
Therefore we currently advise you, especially in times of home office, not to install Big Sur if you own a MacBook Pro 2013 or 2014. All other devices, including the MacBook Pro Retina 2015, should not cause any problems.
