I found out about the SMR about 5 days after my WD Red's arrived. I decided to test some claims and found that zfs RAID filled with random data. Like other reports on reddit, rebuilds WILL result in dropped drives. This happened twice, one on the parity and once on the data drive.
I contacted WD support and they just shrugged. They said I could return them for warranty. They said they will be replaced with same drive or a used drive. (which means refurb older drive with reduced surface life) I offered to pay the difference for the Red Pro drives and again they just said that's not an option. So I was well within my 30 day window to return them, so I did.
If WD gives you the run around, you may do better to take them to small claims court. For some states the filing fee can be as low as $30 (That's the lowest I found any way). Other states will allow you to recoup the filing fee if you win. They cannot bring a lawyer, which means they have to fly out a representative to represent the company. It will likely cost them more than what the drives are worth and they will likely just escalate your case for immediate replacement with something that works.