I previously had a one N97 (Nokia), then iPhone 3GS, then S2, then the S4. I am professionally and personally 100% Apple users, and have business power user of a smartphone. But now the S4 really is the best smartphone, and knew what I had so far. Top speed, the camera is really very good, even in the dark (though since logically with light quality and brightness loss). For this purpose a top-endurance (max. 2 days), despite 64 GB SD card high speed in image processing (sequential shots extremely quickly in 13 MP resolution), top videos, very good phone Acquire properties and with SyncMate also very good (even without a cloud, not via Google) with the iMac to sync (contacts, iCal calendars with many). The camera is so good (use alternately Stock photo app and - Video App and Vignette) that I'm now down to really composed photos with my P1 PEN All photos and videos with the S4. Now I need only a 128 GB micro SD card). Clearly, rear panel could be better - but frankly, I've never used a cell phone out of its case, because I do not ever want to pay attention to the SP with kid gloves. Is so absolutely unimportant for me. There is felt million alternative backs for purchase (where this goes else?). What does matter for me: The weight - surprisingly light despite replaceable battery - and extremely compact for the giant screen. The way, is also very, very good, after updating to 4.3 again a bit sharper (if it still looks at such high resolutions). Another reason for me because I check a lot of emails and attachments (PDF etc. pp.). And active users Feedly am. The only disadvantage (compared to very good LDC panels): For extremely strong sunlight make it not as good as the AMOLED LCDs still to ensure readability. As shell I now use Spigen Neo, after many Try m. M. for the best choice of ruggedness, compactness and appearance / weight. In addition, I have a wireless charging adapter installed (on cover to adapter on the battery cover, done) and use two charging pads (office, home - PowerQi). Perfect.