In my Lumia 1320, i have installed Windows 10 preview by using Windows Insider app(Enrolled as Insider Release Preview).
The current build 10586.164 released on 8th march which has no issues in my phone after a week usage.
Best tips to save your battery by turning off all the background apps.
I feel no lag in my lumia 1320 while multi-tasking apps.
After this build, I found some cool stuffs in calendar app in which you can select the holidays based on countries.
Open the app(Internet required)-> Touch top left horizontal lines-> More Calendars
Select the one you needed.
Your keyboard can be moved any where within the layout.
Just long press the space bar of the keyboard.
That’s all folks!!!
Thanks for reading my post.
Please comment if you have any questions/ doubts.