Any one else here updated their Nexus 6 to MMB29S and noticed that there is more room in the system partition? I went from just under 4 MB to just over 15 MB. Not a lot of improvement but it is a bit more breathing room LOL. Flashed the factory image and rooted it with SuperSU 2.6.6 systemless zip and then renamed the /su/xbin_bind folder so that Android Pay works. All the other apps that require root that I use still gets root access. It even passes Google's tamper test . Great thing is you can use the SuperSU app to un-root take an OTA and reflash the zip to re-root the phone. Don't have to flash system and boot images any more to un-root. There are some things that have to be watched and complete instructions are on Chainfire's SuperSU forum on XDA.