I’ve owned a few Samsung Galaxy devices (SII, SIII and Tab 2) and I found the quality of the pre-installed Samsung software pretty low. It always seemed strange that Samsung would invest in near perfect hardware design and then followup with only half-hearted software support.
It will be great to see the official Microsoft mobile apps pre-installed instead, which would reduce TCO an an enterprise wanting to enable their mobile workers on this platform:
http://www.sammobile.com/2015/02/12/exclusive-galaxy-s6-software-will-bring-some-amazing-changes/
Salesforce & MuleSoft Blog 