Frequently criticized
Two commenters confirm Plex cannot be installed on the DS218play because its custom Realtek RTD1296 CPU is unsupported, which closes off a popular app-based transcoding option for media streaming.
Strongly criticized
Plugging in two drives automatically configures them as a RAID mirror, and undoing this required a full day of troubleshooting, stopping services, recreating shares, and a 4-6 hour parity consistency check after just unplugging one drive. The user called the software confusing compared to competitors.
Generally negative
One commenter is concerned about having to take the case apart and screw in drives manually, noting that most current NAS units instead allow front-loading drive swaps without disassembly.
Generally negative
A commenter with a history of failed hard drives points out that the NAS is still only as good as the hard drives installed in it, implying the unit itself can't offset poor drive reliability.
Mildly negative
A commenter questions the point of having a 64-bit processor when the operating system itself is only 32-bit, suggesting an internal design inconsistency.