Q#1 One for 9 months, one for 8 months, one for 0 months (0 months camera was DOA).
Q#2 One failure, new camera purchased arrived DOA
Q#3 All cameras have POE.
Some details from my DOA camera. Purchased a new Huisun V1 from Monitech International Company Limited on May 9, 2016. Camera arrived on May 25, 2016. It was DOA on delivery. Symptom was the camera would power on but immediately rotate back and hit the bracket. It would work for about 60 to 90 seconds before dropping of the network (no longer visible from SADP or Internet Explorer). I worked with the seller trying various things. Nothing we tried would get the camera working. On the last day that I could open a dispute I reloaded the firmware, but it didn't help. The seller ended up providing me a full refund (which just appeared today on my credit card) of $168.00 and the seller sent me a prepaid shipping label to return the camera to a USA partner of theirs. The return shipping was via the USPS, so I just handed the box to our local postal carrier. While I was disappointed about the camera being DOA, the handling of the camera return couldn't have been easier. Needless to say, I don't think I will purchase another Huisun. I'm still happy with my 2 Huisun cameras that still work, but if one or both go bad, I will probably look at other cameras for a replacement.