DO NOT BUY THESE ASICS!!! I keep telling you people!
Right now, at 13.4 billion difficulty, a 500 Ghash miner will get you 0.01868 BTC per day! That's it!
And when the difficulty adjusts to 17.1 BILLION in 3 days, it will make 0.01471 BTC per day!
At the current price of $568 per BTC, that is $ 8.35 a day, before power costs and before purchase price.
ROI - NEVER!!!!!

Send your money to ME if you are so determined to piss it away on something!!!!!

At least I will invest and spend your money wisely, instead of letting it go to some ASIC company owner laying on the beach and laughing at all the people who bought an already obsolete miner.