Tai_Pan almost word for word same experience I have with trying to order..... but may be a good thing because I saw that someone mentioned that there could be some power problems with them as they can top out at 800 watt and only have 3 pci-e connectors to power 3 boards.. that's a lot of juice on those lines... not sure how safe that would be?
It shouldn't be a problem at all if you use a 1000 or beter a 1200w PSU with 6+2 pci-e cables.
And some extra cooling ( air conditioning or just medium size computer fans ).
The x10 model has 1 intake fan but no exhaust as I've seen from the pictures and no holes either in the metal enclosure.
That could be the real problem but it can be fixed by adding extra vents for exhaust.