This is to go in a Mac Mini for use as a HTPC/Plex server/whole whouse Squeezebox server/general family file server.
The Samsung material seems to define the 845 DC Pro as "write intensive" and the 845 DC Evo as "read intensive".
Reason I am looking at these is because of power loss protection that only this and the Intel 730s seems to have. We tend to suffer power outages from time to time and so far this has probably contributed to early bricking of a Crucial M4 that I had in a self-built Win 7 desktop that was doing these duties described above.
Also, If I understand what you are saying the Samsung 840 Pro has no problems whatsoever?
No, the 840 Pro uses a different controller from the Evo and the Pro also uses MLC NAND, which is far more reliable.
Most datacenter SSDs are actually optimized for intensive random read operations. If you compare the raw IOPS figure and sequential figures between the 840 Pro and 845DC Pro, you'll see that the 840 Pro wins in all aspects, except for the lack of power loss protection.