I wouldn't buy from this guy for a number of reasons.
1. OP communication is poor...he doesn't bother to answer questions here
2. 0.55 btc = 400+ usd - that is a price for the ebay not for the community on here
3. I can buy 2 blue/red furies for $300 usd.
4. He changes the prices as he likes
5. Bitfury chips cost $19 usd each.
I personally do hope he lowers the price significantly after taking profit at current levels
You can buy 5 Technobit NanoFuries from Technobit for the same price, not 2.
http://technobit.eu/index.php?id_product=51&controller=product&id_lang=1
Appears to be out of stock.