I have a Synology DS209 and a Drobo V2 with Droboshare.
On the DS209 I can copy a 4.7Gb file in 3 minutes.
The same file to my Drobo takes 38 minutes!!!
Both connected to the same Gb ethernet network both with Cat 5 cables.
This is REALLY slow.
I have seen a peak of 19Mb/s from the Drobo which I would be very happy with bit most of the time it can barely manage 1-2mb/s!!!