Farhad Manjoo for The New York Times:

The S6 phones are made out of aluminum and glass rather than the plastic in Samsung’s older phones. Both the S6 and S6 Edge strongly resemble Apple’s iPhone. The S6 in particular looks like Apple’s brother from another mother. Samsung has also co-opted many of the design ideas for which its fans have long criticized Apple. The new Galaxys no longer offer a removable battery, for example, or a slot for add-on storage cards, and unlike the Galaxy S5, the S6es aren’t waterproof.

And

But if the new phones are beautiful and functional, they are still something of a pain to use. The S6 and S6 Edge run Samsung’s modified version of Google’s Android operating system. Despite Samsung’s engineers’ efforts to clean up the software, the phone’s interface is a hodgepodge of odd design decisions and overly complicated functions.