Installation experience:
The update takes around 25-30 minutes in getting downloaded over a good connection. The update is around 500-800 MB in size. Installation and data migration takes another 20-25 minutes. It went quite smoothly for my device. You may need to go to Windows Insider app and reselect Insider Fast ring in case you have reset your devices for fixing any bug. In case you are new to Windows 10 for Phones preview you need to follow our tutorial for updating to Windows 10 for Phones.