buy only batch 1 of any bitmain product is moral of the story. d3 is negative, a3 is negative, l3 is also negative now.
The only thing that makes more than $1 a day is the x3, which is an extreme high risk coin, because coins using cryptonight are actively forking away from it.
i personally have a z3 mini on order (1st batch), but wont be buying an august batch even though i can get it for $600+shipping after coupon.
yeah u should Roi on batch one like I did in the A3 only because I sold all the sia I mined , other people i know are bagholding 80k sia from batch 1 door stops and the price collapsed from .03 to .01
If u do buy one sell what u mine asap till u have what u paid in btc or fiat back
then feel free to bag hold