[Sprint Samsung Galaxy Note 3] rbaucom:
Ok I have both. The note 5 has been the only phone I have not rooted in my life. The bad no removable battery. The greatness quick charge and currently my all day battery life, and the camera.

I did the note 3 to note 5 rom. I was impressed. Especially with the camera. The turn on time (wow it's as fast as my note 5 turning on the camera) and the auto focus works about 95 of the time.

I went back to the note 3 rom because of a copy existing calender entry to alternative company calendar that the note 3 Samsung calender has in it. Samsung removed that feature.

The missing sd card? I didn't miss it as much as I thought I would. HOWEVER, I have not take a vacation to a location where I did not have high speed wifi access to this year. Last vacation we filled up 3 64 gb sdcard between my wife and I and our camera as well. I do find myself taking more pictures now because of just how good the camera is on the note 5. I have used Google photos and set it to high quality and to MY EYES ? I can't see the difference between what Google's compression algorithms and the original photos.

The really bad, not being able to use voice and data at the same time till VOLTE gets rolled out on the note 5, AND the antennas are not as good as they were in my note 3. Previously I always had signal where other people had none. We work in the centers of old buildings. I always had signal on the note 3, every one else's carrier had no signal, att Verizon and t-mobile. Silly me I thought it was just Sprint. I've taken both phones and used signal measuring apps yeah, the note 3 gets the signal where now I do not have ANY signal. The high speed data downloads? Not yet in my area. So I can not tell you how great it is. On the areas where I do have signal I use Google voice and call people back using that number, if I need to use both voice and data.

The gps lock is not as good as my note 3, I solved that with the purchase of GPS status and have it set to auto download the APGS data every 6 hours. With that done it's better on gps than my note 3.

This is my second note 5 my first one was a bad unit (it happens). Because I purchased a 64GB unit when my replacement unit, came in they gave me the new box and everything in it. So I got a new charger and headphones ect for free.

OK, my concerns for the future. Battery discharge cycles. I have 3 batteries plus one dead battery on my note 3. I'm afraid that I will do the maximum number of full discharge cycles and ruin the battery my first year. Will sprint be able to replace it at the store level? Who knows?

I've read someplace (the forums I think) that Samsung will replace the battery the first year. I will believe it when it happens to me

I really do use my phone ALL DAY, with my job.

I'll see if I can find the steps for the note 5 rom upgrade that I used and link to them.

TLDR (too long didn't read)

BEFORE you do that, I recommend that you use a fstrim program and see how your NAND state is.

https://play.google.com/store/apps/details?id=com.fifthelement.trimmer

Mine on my note 3 is pretty degraded from using it so much.

So it was a hmm how much longer is my note 3 reliable even using the fstrim application.

I'm loving my note 5. If it had replaceable batteries and sd card I'd love it even more. But then what would we have to complain about?