What are people getting for *actual* power draw with these @ the wall?
Most 650w-750 watt gold power supplyes will draw 370-384 watts at the wall with one of these units.
Why would customs seize perfectly legal and duty free computer parts ?
Customs sometimes will levy import duties and brokerage fees. Thus computer parts are not always duty fee. I'm not sure if you have seen it or not, but in reality... quite a few shipments from China have been held-up by customs in the recent past.