I had one 220v unit fail and one (that I ordered for a mate) DOA.
The DOA took me about 40 days and a Paypal case to get a replacement which just arrived yesterday.
The first unit I bought for myself ran awesome but it died last week. I only got about 6 weeks of use out of it but I was running it at 2:30-3 nearly 24/7 thru a WeMo during that time. I won't be doing that again.
Took it apart, the usual suspect, both the wires to the heater just disconnected like someone had desoldered them.
The DOA unit for my mate took so long to replace that he didnt want it anymore thank goodness cause now I have a working Cloud again.. woot!