Watch out, don't order it if it is too suspicious. I would recommend you wait for future ASIC miners which have a better chance of ROI.
What would be the right price and timing for ROI? If a 2TB miner comes out for $500 next year and typically ASIC makers will sell preorders to reap the profits first because they know the risk-takers will bite.
Then the machines flood the mining pool and the next batch orders becomes useless. It keeps going on and on.
Your right, preordering is very risky because
- your delivery date is not guaranteed
- you dont now how many units are preordered
thus you have no idea of difficulty when you finnally receive your miner, thus making profitability calculations tough hen deciding about preordering