Been looking at the Synology units which do look good but I'm getting the feeling the software won't be as user friendly, they seem to concentrate on the hardware in write ups but not found much about the software. Deffo using Red drives and will probably just get pre-built as this seems a better option. The WD software looks really good but I'm a little concerned over previous comments, all be it on older units :-)
Will be used to backup several PC's off site, I appreciate speed issues with this but not masses of data once initial backups are complete and hopefully it will be incremental thereafter.
edit: I was looking at an add on Synology unit hence no software discussion doh :-(