You also didn't mention what that failure rate was. Has it been two drives in two years? 5?

I bought my Synology two years ago this week, and I've never had a drive fail on me (*knocking on wood*). It only has four drives and for a long while it only had three, but I do have a couple video cameras recording to it at all times, and I've set it up for headless Crashplan (a real PITA), so it gets some work.