For all the problems are always times gennant:
Display: The Smearing is not noticed, it would probably not if I had read about it. Otherwise, the display is the absolute upper Mega Hammer! I am something of enthusiasm. Yesterday I got my old S2 again brought out because I want to sell it, and was shocked how big the difference is. The display of the S4 is very sharp, I liked the colors and AMOLED pixels can be seen only with a magnifying glass
Fi problems: Have also a Dlink router, there are now but how to get the problem under control enough to do (see Android Help Forum)
Durability: Hello !! ?? Who buys a device for almost 600 should have good care of it. Clearly it should not break down immediately if it gets dropped, but who takes care should still be able to avoid. And who is so scatterbrained as I bought the Cygnett Workmate Case and is happy.
Otherwise:
The unit runs very smoothly, even people with "micro stuttering" complaining on a very high level. Firefox, games, camera, etc all comes Prima
The camera is excellent, takes great images and razor sharp. My compact digital camera stays at home.
Call quality: Top
Weight: pleasant, not as a lump
Comes with replaceable battery (for a power user like me very important), to keep the thing all day with 4h display turned loose.