The current price of 1.253 BTC per L1 unit is an insane price! Things to consider:
(1) The unit is priced in USD (not bitcoin) so if you buy you are effectively selling you bitcoin at a 3 month low (face palm)
(2) The scyptcoin market is on its last breath and even the most optimistic projects show the L1 MIGHT (if difficulty increase is less than 2%) make a small profit. There just isnt enough upside to risk that amount of bitcoin.
(3) A 3 month preorder is insane. 3 months is this game is an eternity, especially considering how much the scrypt market has gone down. Just three months ago LTC was over $11 today its <$5.
Summary: Even assuming best case scienaro (on time shipping, low diff rise, LTC prices dont continue to fall) this unit will not be profitable.
For me this L1 seems a pure gamble. Need to wait and watch.
Risk is too much to pre-order now. L1 ROI or not is a different topic.