Well... I finally heard back from them.  They are short staffed (should not be my problem), and because of the associated delays, the $10,250 S19J Pro's that I agreed to substitute are now $12,000.  Shipping in a week or so...  They offered me a $200 discount, so the price rise would ONLY be $1,550 a unit, instead of $1750 a unit (over 15%).  The BTC I sent them 6 weeks ago which would have covered (3) of the S19J Pros is now insufficient to cover their new higher price, even though that same BTC is now worth $38,400 - more than enough to cover (3) at their current price.

Bottom line:  Don't trust them on delivery times, if you trust them at all.  Send a wire, not BTC, so that fluctuating prices don't screw you.  I suspect they are going to refund me the cash value when I sent the BTC, $31,286.  If I converted that back to BTC, I'll have lost 0.12 BTC, about $7400, by trusting them.