Have the product now almost one year in the time it was already 5 times exchanged wg div defects. I once had a broken wg in power supply a not inconsiderable loss of data. Drobo told me at that time to the last of warranty period is always an advance replacement is made - which as per users essential for me - unfortunately, I often had the case to their superiors escaliren so I get exchanged the Geröt (you wanted I send the device, and so about 3 weeks without the device would be).
If I could choose again, I would take a raid of Promise.
The case is now being tested in Drobo's see what comes there.