1. Battery sucks, if I have to turn off all of the so-called "smart things" it's not a smart phone.
2. LAG, oh boy does it lag - Samsung as usual tweaked the hell out of this thing and compared to my Nexus with same apps loaded - this thing sucks
3. Phone app - On the surface, looks good, but with the lag awful - when phone is locked, call comes in, the answer or cancel options are at best "non-responsive" so I miss many calls. Isn't this what a phone suppose to do is answer and make calls.
4. Exchange/ Corporate / Activesync mail just kills the "smartphone" functionality. If I get a message while in the phone app, on a call, call stutters and sometimes disconnects.
5. Wifi - When wifi is enable and I use GPS or try to update an app in Play I get server not responding (every time) if not connected to wifi and outside walking. If wifi is turned off when mobile, works everytime.
6. Hype - Yes, industry hype, once again, through all the problems with the Vibrant, sgs4g, sgsII guys like AC and all the others gave Sammy the pass by not performing "real world tests" with apps that people use and instead turned their attention to aesthetics and hardware to rival the "i-whatever" instead of giving us the true low-down. I remember when I first deployed MS Windows on pc's and the norm was to reboot the system to "free up" memory. funny how this industry works.
I buy my phone off contract now and try them out to determine whether it will fit my active profession, I then make recommendations to my customers on deciding BYOD and this is not one that will be a recommendation. Yes they sold 9 or 10 mil, but it was and continues to be hype and if you look pass the beauty, pure unsupported crap.
Funny how this industry has evolved. There was a time when I had to "smart" up my dumb phones, but now I'm finding myself "dumbing down" these smart phones. It makes it worse that its a TMo carrier. Go ahead and bash me if needed, but I spend LOADS of money on these devices to make a useability and functionality decision for business users and this one does not live up to the hype. Just my opinion.