Ok, I thought I would share this with the group here. This will be a bit long, so bear with me:
So a few weeks back I attempted to install W10 on my SE using the intstructions. The install went smoothly, but I had all sorts of problems with the new build afterwards. Internet was spotty, restarts, several key apps simply didn't work at all. So I begrudgingly rolled back to 8.1 and assumed I would have to get a new phone in order to move to W10. I didn't like the SE much with 8.1, largely because it didn't allow me to use only 2 columns of tiles instead of 3, and that made everything SO small. So I went back temporarily to my LG G2 and figured I'd wait until a decent-spec'ed W10 phone came out at a good price. (Damn, why can't we get W10 on a great phone like the G2?)
Anyway, I got a wild hair one day and decided to try switching over from AT&T Straight Talk to Verizon Straight Talk. I occasionally travel to rural areas in Iowa and AT&T coverage is poor there. So I bought a CDMA code and switched back to the SE. I was having problems getting the data to work right, so I figured before I switched back to the G2 I'd give W10 another shot and see if that would help things. I knew from prior experience that I could at least edit the APN settings on W10, something not allowed on 8.1. So I figured why not? Being lazy and not having the slightest bit of confidence that this would work, I decided to skip all of the resets and instead just do the upgrade normally. Much to my surprise, the upgrade went swimmingly, and I was on W10 without having to re-install and re-configure all of my apps.
I've been using it this way for about a day now, and everything seems to be working fine! I even have my 2 columns of tiles back!
So if you're still on 8.1 you may want to give this a try. Just make the registry hack to PFD, change the model to the Nokia RM-927, install the Windows Insiders app, and update away!