Been using the SE for 5 days straight, while leaving my Nexus 6P behind all day.
Coming from Android(ever since 2009), and this is my first iPhone and iOS device. I'd say wow I never knew I'd have more fun than I would using this phone for a day to day use.
I chose 16GB SE cuz I am afraid to take the leap to the 7 PLus or 6S Plus, afraid I wont like it. Plus the SE I got for 1649 after using code on GEMFIVE. Thats a bargain I guess.
I thought I'd share my experiences, not exactly a review. In case someone looking to get this SE.
The optimization for the battery is awesome!! I can't really kill this thing for the whole day, plus I only had that one included cable at my home so I cant really charge it while driving or at the office but damnn I can be rest assured that it consistently been idle when not in use and I love the total control I have over the background refresh per app. I can tinker with settings and play around with the camera and not even 1 percent dropped. Still amazed by it. My latest battery usage: unplugged at 7PM last night, voice calls for 2 hours, whatsapp and instagram moderately, some emails, currently at 39%. About 16 hours of standby and 6 hours of usage. it even rang the alarm for quite some time since I kinda overslept this morning. Wow. Just wow. hehe. I know its cuz of the smaller screen and resolution, but my 3450mah 2k 5.7 inch Nexus 6p would have died on me by 8am this morning.
I love that I can use this phone one handed again after a few years of using big phones, but at the same time damn typosss a lot during the first 2 days. Now i just got used to it.
the screen itself is okay, when u dont compare it to a higher resolution one, but damn my nexus 6p screen looks gorgeous eveytime i turn the screen on. but battery life over screen any day for me! no complaint though!
Raise to Wake feature, works really well compared to Android's ambient display. Always turned on when expected, so i dont have to guess everytime I pick up the phone.
Auto Brightness >>> WIN! Complete WIN for an iPhone. I never realized when did the slider ever changed when go in and out from the outdoors.
Camera is snappy, the phone body didnt easily became warm when used a lot. Camera interface a lot more user friendly, point of shoot is what i like. 6P wins in lowlight and even it outdoors but i take point and shoot with quality any day since n6p will take a good 1-2 seconds, especially with HDR+ turned on. and n6p will become warm easily cuz of the processing. when it gets warm, battery life decrease faster.
Selfie camera kinda good for it 1.2MP but my N6P 8MP had a lot more details and better in lowlight. However if you always take selfies outdoors and never zoom it in, its pretty decent. I am still amazed though.
Speaker quality is good but loudness cant beat front facing stereo speakers.
Mute switch, godsend.

iCloud, +1. I invested in Google Drive since it was launched but backup and restore on the iCloud is magical. hehe. Its like i dont have to worry if i ever change iPhones, reset them, etc. Everything will be back onto place, just like I set it up. I am considering to upgrade the plan to 50GB one, once I got used to the ecosystem more.
Storage, currently 16GB is enough for me though. Not an issue.
Sharing, better than I expected. I guess that's an improvement since iOS 9 i guess? I guess now I can share to supported apps via photos app directly, instead of going to the Whatsapp/Telegram itself. I used to get annoyed when using my friend's phone to send photos to me. hehe.
Airdrop >> Another magical thing. Its fast, and it works. Sending videos with hundreds of MBs completes like a breeze.
iOS10 kinda nice. I like the most part of it and somehow the grid app drawer grows on me. I just dont want to mess with it and use my phone and apps. Widgets on the left of the screen, love it cuz I dont need to put it on the homescreen. the only thing i wish is if i can drag the apps to my desired position(to be able to view the wallpaper haha). I do however miss the Now on Tap, Google Now, and grouped notifications on Android. I really thinks that Android handles notifications much better but I guess looking the badge notification still works for me.
Software/System updates! WIN >> If Apple announce it, and your device supports it, you'll get it on the same time/day as the latest flagship. Definitely best support on this. I can be rest assured my updates wont be delayed without any odd/weird reason.
Ouh and last night I spent 30 minutes converting and dragging a tone so that i can use custom ringtones through itunes hahahaha. this i cannot tolerate ah, so annoying but i guess its just one time(since i only use 1 tone for a lifetime) so i'll let it pass.
As for the App Store, not sure I like it more than Google Play. IMO Play curates recommended apps better(but maybe thats cuz i am still a new Apple user), and the user interface is more user friendly than the App Store. But thats personal opinion.
In conclusion, for someone who kutuk iOS over the years, and only ever used Android. SE is a good device to try, and I am not disappointed.

The things about iOS though, the features such as Facetime, iMessage, Airdrop seems like a little things that should have lots of features, but it works for what it was expected to do. Sure Apple controls what you can and cannot do, but somehow its a peace of mind, in a weird way I guess coming from someone like me.
I guess thats all for my experiences. let me know if there's any tips and tricks that i dont know hehe
TL:DR >> I am happy with my purchase and not regretted one bit. I might even become an iPhone loyalist after the 7.