Couple quick comments from poking around in SE a little. Although the consensus is it won't work I did get my modded save to load and it didn't crash at least in a short play session. However as would be expected all the modded stuff is missing so armours were missing, etc. So, the consensus is right, it doesn't really work, and not an option to play my current game in SE until the mods are released for it. Oddly enough some web searching says that even if you clear the mods and resave and then bring to SE it still won't work. I don't understand that one. Haven't tried it yet myself just because cleaning up all the mods is no small task either.
As I said before, I am so happy with how the game looks and runs in my current original modded state that I won't be switching to SE likely until the majority of the mods I use are ported and I can move over my save. The SE version looks good and I do like the extended view distance (have never played with those mods in any serious way), but there are these little mods I use that without them the game feels just a bit less. Little things like scaling my character in the world to be the actual height he should be. So instead of Lydia (one of the companions) and I looking eye to eye, I'm the tall guy I envisioned my character to be. There are more but that one stuck out as I have become so used to how everything looks through the characters eyes at that height that I was confused as to what I was seeing when I loaded up SE and Lydia seemed to be a giant Amazonian! That would be fine in another story but I digress...
Some of the mods I like may be out already for SE and at some point I'll do an inventory of what I use and what is out, but I don't want to spend time on that right now.
But the other big thing that is annoying (and I believe was mentioned) is that they didn't support ultrawide res! I mean if people on the Internet can figure out going into an ini file and finding a kludge to make it work (sort of) surely Bethesda could have put a few people on it and supported ultrawide and could have done an ultrawide UI, again that modders are already having some success with. I think that really should have been a given in 2016 and they dropped the ball there big time. For now the original version works great for me with Flawless Widescreen and I don't have to mess with it.
So as the modding community gets all their stuff (especially SKSE and SkyUI) ported over to SE I'll have another look but for now I am quite content in the modded original.