Samsung Galaxy Tab S is a great mini tablet and now there is a way to root it using CF Autoroot tool. This tool must be used with Lollipop and Kitkat firmwares only and only with SM-T800/SM-T805/T700/T705 Exynos only.
It shall also be noted a lot of people that are looking to root their device also flash Galaxy Tab S TWRP afterwards and I feel that it is unnecessary to do both steps, so an XDA developer made an all in one package to root and then install TWRP recovery. Simply flash with ODIN. Odin 10.6
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cf-autoroot-twrp-t705
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This is a great method to get super user permissions on your tablet. We tested it on our Samsung Galaxy Tab S and we got root permissions and recovery works great as well.