I'm first time Android user since moving out from iPhone. This is my first purchase of Samsung Galaxy S4.
Been following this thread since V1 till now. Here is my feedback after using the phone for 2 weeks
My usage of my phone is mainly calls (1 hour) , social networking,camera, games, websurfing,whatsapp,
Services such as Wifi, Data, GPS, Multi Window, S Beam, NFC, Air View, Air Gesture, Smart Scroll, Sync = always ON
My battery usage after full charge and at 5% = 15 hours . It's a huge difference for me since I'm coming from the fruit clan
After disable the Google Latitude service my battery lasted for 25 hours with same usage
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I did not notice the camera start-up time slow at the beginning until I receive the software update on Monday. It's faster now. Those who just bought the phone should try updating the software.
Those who complaint after testing the demo unit, well it's a demo unit, so many hands touching it and installing too much software. Try playing with your friends phone and see the difference for yourself
As for the readers who not sure if should buy the LTE or non LTE version, I would say go for the non LTE ( the current one in market). Mobile networks are not fully upgraded to 4G in many areas yet. In KL if I'm not mistaken it's only near Damansara area so far. I would only go for LTE version in 2 years time. Not now. Plus I'm happy with the 3G speed for the phone. It's not that I need faster speed to download movies
It is not easy for me to purchase anything, I would make too many consideration before I buy anything and Samsung S4 is not spared from this. I'm happy with my purchase

Good advice, another former iphone user. I still keep/using iphone coz not really familiar with Android world.