I'm currently using a Lumia 920 bought since 26 Dec 2012, and I've been a Windows 10 Mobile Insider since build 10166, and currently running build 10581. I have to say it's the smoothest build ever since all those other builds from Microsoft.

Also Insiders from US/ Europe recommends a reset after installing these build for stability. But I have to say I lost glance screen from this update and it's a terrible experience, I've no way to get it back.