HI I have 925 with insider app installed, an update was ready to install, I thought it was windows10, but it was 8.1 GDR 2 same as the 640 has installed, settings are different and can rename phone in settings, will look here on forums for what else is different, then windows 10 10.0.12534.59 update was offered, but delayed it until I know it's worth installing, any advice on this update would be appreciated, do I install or wait for official update?, many thanks.