It is more safe to wait till March, when the first batch is supposed to be delivered to first customers.
I agree.
I've said that I don't doubt that a small production run of miners from Halong exist. 1 or 10 or however many you want to debate - my issue is why the three month wait? To me, that means they're selling shit they haven't even produced yet. Or if they have produced them, they're being burned-in BFL style for the next three months before they're late to ship. This way, the difficulty level will change, and...oh there's a testnet for burn in? Nah...
At least with a Bitmain preorder, you have some amount of confidence they'll deliver based on their past performance. Halong is just another nobody in this niche market.