Poorer price performance and efficiency than the A9 Zmaster that's released a month ago.
Exactly my thoughts on this- funnily enough ASICminer even claims that this is the world's most profitable miner in the product description, which is true for now but doesn't change the fact that it's priced horribly and the Z9 is a better machine overall like you mentioned.
Besides that, we don't even have any recent evidence of ASICminer delivering any miners (haven't seen anything about them in BTC mining speculation), and they don't have much of a track record ATM. They say they have a BTC miner out but I assume it's basically vaporware as I've only seen a tweet from their headquarters that it even works.
Miner product listing from ASICminer:
Link