I'm considering starting mining for the first time and it looks like Antminer S9 is the way to go in that price range (other suggestions in $1000-$5000 range is welcome. $0.08 per kWh).

Is it safe to buy from Bitmain? If I pay for an order now, am I sure to get one from the november batch? Or am I risking that they suddenly are out of stock even after I pay?

I don't feel so good about paying so far in advance, with a currency that is charged immediately with no refund possibilities.

What do you think? Should I go for it?