Greetings,
I purchased a used 950 from Swappa several weeks ago. I installed Windows Insider and run Release Preview. It runs fast and smooth.
I installed a 64GB MicroSd card where I store most apps, music and photos. However, since this phone is blessed with internal 32GB, I have the entire USA map, and several games including Asphault 8 Airborne stored on the device, as these programs run better from the device rather than the MicroSD card, IMO.
In addition, I spent a lot of time setting up my notifications. This can be somewhat tedious, but worth the effort.
To maximize the battery and get me through the day, I have carefully chosen which apps can run in the background. I keep the screen at 75% unless I'm outside, then bump it up to 100. I also purchased a cheap QI wireless charger and just lay the phone on it when I'm home.
To save cellular data usage and to increase upload and download speeds, I shut off the cellular data and have the phone set up to automatically connect with Wifi at home, too.
I have not been successful using Windows Hello, but didn't expect to since I wear progressive glasses.
Continuum does not interest me, and I use Cortana sparingly due to privacy concerns.
I enjoy tinkering with the start, lock screens and settings. The windows mobile OS can be frustrating, but I wouldn't have it any other way
I hope this helps you with your new 950:excited: