They don't appear to have their website up yet, at least when I try to go to it from their ad post here. They also have several people complaining in their thread about past dishonesty of their Burnin's reseller. I do not know if these allegations are true, but if so, I would be very weary about dealing with them. Again, no expert on Burnin or CrypX's reliability though.

The price is also higher per a chip and they are not sure if they will all hash at that rate. It is very possible their 4GH/s chip was an outlier and they already know this, as their claims only state they have one chip hashing at that rate. I would be weary of that as well, as even with the guarantee the price is a little high.

They are also stating the most optimistic shipping date possible. Perhaps they will meet it, perhaps not. There is certainly a risk there I would say, although not a huge one. Customs could be a major pain depending on where they ship from.

Hopefully they will work out for you, but its probably not best to come into other seller's threads and try to stir up controversy after already having purchased a competitors offering. I understand if you were just trying to help people get a better deal, although the better deal is arguable.

Have a good day!