Any custom ROM is never as stable as the software that your phone gets pre-installed from the factory. However, custom ROMs, especially from CyanogenMod officially, do tend to be very stable as they are regularly worked upon. The gist of the matter is that CyanogenMod (CM) provides longer support for a smartphone than the manufacturer of that device. So installing CM ROMs on your outdated phone is obviously a very good way of keeping your phone up to date even after the manufacturer decides to forget the phone forever.
Samsung Galaxy Tab S 10.5 and Tab S 8.4 are among the top Android tablets that we have seen in the past few years. These two devices are considered the best options, but we know that Samsung will eventually move on and stop providing support for these great tablets. Nonetheless, the Wi-Fi version of the Galaxy Tab S 8.4 has already received official CyanogenMod support in March this year. And now its time for the rest of the models.
The LTE variant of the Galaxy Tab S 8.4, codenamed “klimtlte”, has received official CyanogenMod support. The support has also been provided to the Galaxy Tab S 10.5 (Wi-Fi), codenamed “chagallwifi”.
So if you own any of the above mentioned devices, you can go to the official CyanogenMod page for the Galaxy Tab S 8.4 (LTE) and Tab S 10.5 (WiFi) and download the custom ROM to the tablets. But make sure you proceed with care, as these ROMs might not be completely stable in their earlier stages.