This looks like a classic opportunity - if you go to Amazon and add an Antminer to your cart, Amazon will offer a Squaretrade warranty for 4 years for about $40.
Even if Squaretrade is a pain in the ass to deal with - 4 years of coverage could be what takes an S9 at current market pricing from a bad deal to something worth doing.
Any experience dealing with them? Lots of bad reviews but then as with most things in life there are good reviews also. If you bought a ton of Antminers and you have a lawyer in your family maybe their "job" at the mine could be filing small claims actions against Squaretrade every time they deny you coverage for a failed S9.
But seriously - any feedback? Thoughts? You could carefully document the operating conditions of your mine - wifi connected thermometer to record room temps, 24/7 video recording of physical room conditions. Video documentation and log of regular dust cleaning, etc.
I have some court experience at the small claims level in landlord tenant disputes - and one thing I have found almost always helps me win is careful documentation. It's so rare for people to provide judges with this that it's usually enough to sway it your way.
I would think you could buy 10/20/30 antminer s9's, put warranties on all of them, document your mining conditions and wait for the failures to begin - with a plan ready to execute to force Squaretrade to repair or reimburse you in a reasonable timeframe. If they don't - start the small claims files. If they actually show up to court instead of cutting you a check - you're ready for their counsel. Win once or twice - and they will most likely stop showing up to keep fighting the same judge.
What do y'all think? If you have good priced electricity and a facility you don't have to pay extra for - this looks like a way to ensure a multi-year income stream from S9's even as difficulty rises and more efficient machines show up on the market. Yes returns will drop but at least your hardware is protected.