I have spoken to them on the phone (in full panic mode) at the number listed on their website and invoice. German accent. They responded to my emails within about 20m at approx 1300 UTC today.
Another user posted in non-newb forurms that they refunded 11BTC to someone who asked. So far, I'm nervous like I would be sending 5BTC to a relatively unknown internet entity, but I haven't read anything definitely scamesque, such as refusing to cancel/refund an order without good reason.
Time will tell if they can deliver the goods on time/spec. Given that the 5BTC is all old mined gravy, I'd probably be happy with the shiny case to pile my obsolete hardware in.
Due diligence is best performed before hitting that send button.
The fact that no one wrote that it`s a quite probably a scam is, because there are 6 more weeks
to come.
Next thing you can expect is moving the deadline for shipping, `due to the enormous demand
we ship a few weeks later, we are very sorry for that`
Furthermore the number is a mobile Lyca number using the Vodafone network
just check 0152 16941826 on google.com
And by the way, who is the owner of the
http://www.xtrememiners.net website?
From whom you expect your hardware, since there is no company address listed?
You can only pay in bitcoins, good luck in getting your money back
in case you wouldn`t receive your mining hardware.
Actually I would be very much surprised if anyone would receive any hardware.
You can forget about it: no address and only payable by bitcoins, what other
warning signs do you want before all alarms go off?
And regarding the shiny case, I don`t think anyone will get it!