wait, don't buy s4 unless you really want it.

if can wait, wait for s5 or wait till s5 is out, then s4 price will drop.

personally though, i9505 suxs, the end.

so far don't really have screen burn issue.

battery heating i think is common, the more you use, the hotter it is. my s4 is super hot when i'm charging it with yoobao and using waze with gps on, but i think it's normal.

camera wise, i really feel i9505 has terrible camera issue. blurry pictures are the main culprit, slow focus and slow picture taking as well, there's an obvious lag compare to htc one. overall, for a normal user, it's very disappointing.

i'm using i9505, so i can only comment on i9505.

do note that i9500 do not have lte. and i9505 storage is bigger.

you try with normal light condition, just normal shots, some might look blur.
can't comment about custom rom, decided to stay stock. 

Owhhhhhh, like that aaaa? 

So me can use Custom Rom like CM.
S4 Stock Rom so win of Bloatware.

But then again, if cannot r00t, cannot achieve full access right?
Damn KNOX.  

One of reasons me want to r00t is that to install Security Apss like Prey and Cerberus.
Me Galaxy and Nexus 7 recently stolen, and he hit the jackpot, the devices were unlocked, no password.

Sigh,
If install Security Apss like that, people can still do Factory Reset.

What problem you facing with Camera Performance? Sure every phone will have here and there no meeting expectation.. like that no phone is good for you... wifi connection unstable... hmm... so far so good for me...