Windows 10 for phones finally became available just over a week ago on April 10th for most Lumias, excluding the Icon and 930; then a week later, Microsoft pulled the update for the Luma 520, 525 and 526 citing problems with rolling-back to Windows Phone 8.1, which it acknowledged on its Community forums stating:
We are seeing some reports of failures on Lumia 520/525/526 devices when trying to roll back to Windows Phone 8.1 using the Windows Phone Recovery Tool.
Aside from the known issues disclosed along with the build when it was released, people who opted to take the plunge and update to the preview have been busy reporting issues via the Feedback tool installed along with Windows 10 for phones, and in our forums where we have a thread for known issues that our members have experienced.
Now that more than a week has passed, have you decided to roll back to Windows Phone 8.1 or are you sticking with the preview? If you have had problems with the build, share your experiences in our dedicated forum thread or let us know in the comments section below.