<P> The Galaxy S6 received a generally positive reaction from early reviewers, noting its higher quality design over previous Samsung devices, along with refinements to its camera, the high quality of its display, and the significantly smaller amount of "bloat" in the device's software . Anandtech believed that the S6's new fingerprint reader was comparable in quality to Apple's Touch ID system . The Verge concluded that the S6 and S6 Edge were "the first time I've felt like Samsung might finally be grappling with the idea of what a smartphone ought to be on an ontological level ." Some critics raised concerns over the S6's regressions in functionality over the Galaxy S5, particularly the lack of removable battery or SD card, arguing that it could alienate power users who were attracted to the Galaxy series due to their inclusion . </P> <P> Wired felt while its dual - sided curved screen was better - designed than that of the Galaxy Note Edge, the S6 Edge's use of the curved display was a "dramatic step backwards" due to the limited number of edge - specific features available in comparison to the Galaxy Note Edge . As such, Samsung was criticized for providing no true justification for purchasing the S6 Edge over the non-curved S6, explaining that "it doesn't do anything beyond the base model, but it'll be worth the money to some people because of how it looks and the air of exclusivity it communicates ." The Verge was similarly critical, arguing that the additional features were "very forgettable". In regards to performance, The Verge felt that the S6 was the "fastest Android phone I've ever used", and that the company "solved any slowdowns you might experience in Android with brute force ." </P> <P> Some users reported issues with the flash on some S6 devices, remaining dimly lit even if the camera is not in use or the device is turned off . Samsung was made aware of the problem, which affects the S6 and S6 Edge, but has not specified when it will be fixed . </P> <P> iFixit upon review of the phone noted it is difficult to repair, as it is using strong adhesive in its rear glass and the battery . </P>

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