The OS has been very stable for me over all these years, I haven't had to upgrade or downgrade at any point in time when using it as my main desktop pc (in addition of having other desktops). It's not easy if you do want use custom kernels but once your up & running there are many resources available online that can help get things working with ease! Not too much customization options - some apps don’t come preinstalled which may be an issue depending upon what features/benefits from them will make sense within their specific niche software usage profile / workloads etc., For example:- Some video editing suites like Adobe Premier Pro won`t install due its licensing being incompatible wth open source licenses such as GPLv3; Other examples would include games where proprietary license requirements apply.- There isn' t enough documentation about certain aspects so end users have difficulty doing advanced tasks without assistance.