Bit worried to be honest on the previous comments. People saying it's a failure and some saying that nova launcher is a must? Is the lag really that bad?
im going back to the iphone 6s/7 once its out. this phone has been terrible *for me*. stock touchwiz is really really ugly. i've mainly been using nova (upgraded to 5$ version) and a different set of icons. it doesnt affect the lag i get. lag is just seemingly random. if i get an alert on the lockscreen and tap to go to that app, sometimes it just takes forever for no particular reason.
a lot of apps compared to iphone are really really bad. FULL of constant ads (not talking about the tiny little mobile ads you see sometimes at the bottom of an app but giant ones that just take over the whole screen at random times when using an app. SO annoying).
camera is super nice but apps that actually utilize your photos like instagram/vscocam/etc etc all automatically compress your photos SO poorly and make shots look terrible if you ever use those services. i've been taking shots with the s6 but then just sending them to my old iphone whenever i need to post anything.
here is a link explaining how terrible s6/android is with photo apps like instagram (this also happens in other apps for me as well):
A Look Into Instagram's Compression Quality
memory management is TERRIBLE. this phone has 3gb of ram but you'd think it didnt have any ram at all when using it. Chrome constantly refreshes. Apps like Tapatalk always lose your place when you multitask and then go back to the app. when using spotify, my s6 will randomly slow to a complete crawl. other times songs will just randomly pause for no reason at all.
overall the s6 has definitely been a failure for samsung. they're not selling like expected and are already planning price drops even though its barely been available for 5-6 months.
i took this phone on a 2 week vacation across europe. the s6 could barely last half a day while the wifes iphone 6 was just fine. i've been an iphone user since the 3g and wanted to try something new as well. turns out it was a terrible idea.