I bought a couple of these systems.. Been using the 1U twins since the first generation and every generation since.
Just a note, the systems i recieved from this seller were NEC branded, and only have 2 of the expected 3 SATA connections per node. So only 8 usable drives of 12.
Otherwise, seller is very responsive, accommodating. Very well packed, the seller sent two boxes per system - the chassis packed in expanding foam, the nodes in thick layers of bubble wrap. Most others would have just sent them all together and risked damage due to overloading. The price was a hundred cheaper when i bought them though. Would have bought the rest of his stock if I even remotely had an idea of what to do with them....