Build 22 is fine. The fears were overblown. It has remnants of ISIS but it's been removed and disabled completely which is why it's probably so stable. As for root, it allows things like safestrap and rom'ing, titanium backup, doing things like the entitlement hack to unlock the wifi hotspot app, and many many more things. I'm hesitant to help on this though as I am a little burnt out on support. However, if you can read, read again, and read one more time, my House of Bionic will do all the heavy lifting for you. But I'm not patient when it comes to people that just jump in and then get themselves in trouble so be forewarned.
o) Download the House of Bionic 9.7 installer
o) Download the House of Bionic RSD installer
o) Download the 246 FXZ (NOT!!!! the 98.72.22 FXZ...if you get this wrong, you will never be able to root)
-Install the latest moto driver
-Install the HoB 9.7 installer
-Install the RSD installer
-Create a 246_FXZ directory in the SamuriHL_HouseOfBionic directory on your desktop
-Copy the 246 FXZ zip file into the SamuriHL_HouseOfBionic\246_FXZ directory that you just created
-Connect your phone to USB, make sure USB debugging mode is enabled, and MTP mode is enabled for the USB connection
-Run the HouseOfBionic.bat file
-Select the FXZ options from the main menu
-Select the FXZ Keep Data option and follow ALL instructions
-Under the utility menu on the main menu, there's an option for root
The root option is partially experimental. I've updated the Superuser.apk and su binary to the latest. In THEORY it'll create a su-backup that Voodoo OTA Rootkeeper can use, and it'll also install Voodoo OTA Rootkeeper.
Now you can install the OTA update. I have a link to that on my House of Bionic download page. Copy this to your sdcard-ext and install it from recovery. Or wait for the OTA to be pushed to your phone. After the OTA is done, use Voodoo OTA Rootkeeper to restore root. Hopefully.
This process is not tested, but, if it works, it's THE simplest way to do this. I know it seems like a lot, but, believe me, most of it is automated.