We are testing the Synology DS214 within our gigabit network which is pretty much as good as you will get for a home or small office environment. It is a mixed network with several 1GBit switches for ultimate performance.
All tests are performed ten times to ensure that no abnormalities can creep into the final results.
As we would expect with a Synology product, the performance is good. We couldn't quite reach the claimed read or write speeds around 100 MB/sec.
I think Synology Hybrid Raid is in this configuration the same as RAID 1, it does not add anything extra. Synology Hybrid Raid is handy three disks or more, if not all the disks have the same capacity. If you have for instance two disks of 1 TB and two of 2 TB than you would have raid array of three times 1 TB (minus the spare disk). 1 TB of the 2 TB disks would not be used. With Synology Hybrid Raid you can create a extra RAID 1 array of this room.