I'll preface this with 2 things: 1) I just got mine yesterday so my testing/knowledge is somewhat limited and 2) I'm an IT guy and like having the latest gadgets and things but I also never figured I'd want/need a smart watch... That being said here's my 2 cents.
I've been a Fitbit user for about a year now, went from the Flex to the Force and back to the Flex (after the skin irruption thing.. I'm one of the 1%'ers effected). As I said, I like the latest and greatest and as much as I love the Fitbit I wanted more info.. I have the S5 and have been using the heart rate monitor on there but wanted something a little more integrated, so the Fit and Neo seemed like good options. I went with the Neo because I think/thought I'd like the notifications and because from what I could see the Fit just seems too... Something.. Big? Wide? Standout-ish? The Neo I thought would look more casual and 'normal' on the wrist as a watch whereas the Fit was wider (Wide enough to not look like the fitbit) and flashy with the shiny screen and chrome trim and the non-standard shape.
That said.. In the day I've had it I realize the notifications are nice but I'm holding my phone nearly all day.. between texting and emails and news readers (Feedly) - My phone is rarely in my pocket - I never realized before but I'll walk with it in my hand not even looking at it. I realized it because both hands buzzed at once when I got an email - my first instinct is to just look at my phone. Even when its not in my hand, if I'm sitting at my desk the phone is on the desk in front of me so its faster to just swipe on there to see what message I have rather than on my wrist. Which brings me to this observation:
I also have some level of OCD where I'd then need to go into the watch and clear out the messages in there and what seems like a missing feature is the ability to clear from BOTH devices at once! For example, if a text comes in and I read it on the phone, the notification goes away on the Neo but the actual message is still there! When I go in to delete from the Neo it only deletes it on there - not on the phone - and vice versa.. so I end up touching both devices to clear out a text or email. (I'm sure thats something that could potentially be fixed by Samsung, its not a show stopper).
I'm also realizing I don't have much need for apps on my wrist because I do always have my phone on me. I'm a cyclist and even then I either have my phone in my back jersey pocket or in my seat bag. Thats where the notifications would help if they worked better- it would be nice to know I get a text, but while riding my bike I'm not sure I'd respond right away, even with S Voice I just have a feeling speed/motion and S-voice won't mix well. The way it is now, I get the notification icon, but still have to click it and swipe around within apps to see it and reply - not the safest/smartest thing to do while riding. Apps? I know theres not much now, but I'm not sure what they can offer that I'd actually use. I'm trying Feedly because I use the desktop and mobile version so often but its still not as natural as the phone.
I like the concept more than I think I'll actually use it. Primarily I think I want a glorified Fitness tracker as opposed to a Smartwatch which does fitness tracking (Pedometer/heart rate). I'm leaning towards exchanging it for the Gear Fit but again, cosmetically I'm not sure thats me.. I'm going to stop at Best Buy tonight and mess around with it a bit and see.