At BTC2 a piece, these will never make ROI.

Even at 38GH/s and if one would receive a miner as early as the 15th of November (which is highly unrealistic) one day after their promised shipping date, the miner would make a total of BTC1.68 according to http://bitcoinwisdom.com/bitcoin/calculator. At a conservative 30% diff. increase per 2016 blocks.

If you receive the miner today and mine for 8 months straight, you'd just barely make BTC2.

Do not invest.