Airwhale may I ask when did you receive your first S1 and what return did you have from it by now (in BTC production total)?
EDIT: Also which pool are you using?
I actually left my home state for a month and sold the antminer I bought after it mined about 1btc. Plus I was interested in buying some graphics cards and wanted the cash for it. It was from one of Sushi's auctions, and it was one of the last batches before they included the PCI-E extenders. I use eligius. I can't speak to profitability, I can just say that the antminer did what bitmain said it would do.
Besides, I don't think past results can speak to future profitability with these things. No one is sure if Hashfast will ever ship or will vanish into vaporware, if BlackArrow will deliver on time and how much hashing power they are sending out, when KNCs Neptunes will be released etc. It's anyones guess how difficulty will shape up over the next 4-6 months.