Something I almost always experienced with my galaxy nexus and S4, was every time I had an OTA, performance would be choppy unless I did a factory reset.
Add in the touchwiz jank, and that's why I switched to the Turbo... Though Samsung does seem to be getting better about touchwiz lately...
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My only personal experience with Samsung in mobile phones was with the Galaxy S3. It was nice at the start, but after awhile I had issues with
1. GPS (couldn't get a lock unless it was at a window, and then it took around 5 minutes, GPS Toolbox was a must have app on it)
2. Battery life (at the beginning I would end a 16 hour day with around with around 25-35% left, after a year after 10 hours I'd have 15% left)
3. Lag (at the beginning it would fly, after around 8 months it was unbelievably slow. For example when typing it would sometimes take around 20 seconds before it would register what I typed)
4. Screen burn in (the right side of it's display still has a strip on the side from the status bar in landscape orientation)
Besides mobile phones, I've owned a Samsung bluray player and it crapped out after 5 months, just outside the warranty period. My family has also had poor luck with them, my brother had an LCD TV that needed the display board replaced, luckily during the warranty period. He also had, along with a niece and nephew, the Samsung Stratosphere. Between the three of them they had in total 9 different Stratospheres (1 new and 2 replacements each). Since then we've sworn off Samsung. I know some people have great luck with Samsung, but we've had just the opposite. And it's a shame because they do have beautiful hardware, but between their software and (in our case) their reliability, it keeps us away.