it's also AWESOME on p2pool, lowest stale rate I've seen from any mining hardware.
We've only just received our unit... March batch so at least it arrived in March. Started mining on Eligius, was getting arounf 1.6TH out of the box, so not too bad considering. However, just switched to P2Pool, and hash has dropped to around 1.2TH. Any special config options I need to look at? Rejects are reasonable... ~4.5%...