I thought the factory packing of my BK was pretty darn good, though I admit that for the price, it could have been better. But it was certainly adequate. The one thing I didn't like is that the bubble wrap was taped to the skimmer with brown packing tape leaving a brown sticky residue in a couple spots. But it did clean off fairly easily.
My 400 is the internal model and is water tight in all areas except for one. The only area that has a slow drip leak is where the telescopic pipe that you raise up and down fits into its connection on the skimmer. But mine is the internal model that is for in-sump use so it is a moot point. The externals use couplings which provide a good seal.
I agree with what moonpod stated about the dual outlet pipes. I really don't understand why there is a need for 2, but I will not doubt Klaus's expertise in this area. If he thinks there should be 2, there is probably a good reason for it. My internal model comes with a sinle larger outlet pipe. I think it is around the equivalent to a 2" diameter. There is no way this skimmer is going to take in more water than this pipe can handle.
The adjustable nozzles are only for the internal models so you can control the water input. Klaus has stated that the pump will suck in the same amount of air regardless of how much water is being sucked in. I have found this not to be the case, but I don't have a large enough air flow meter to verify it. With my nozzle screwed most of the way in, I get a skimmer body that is sparsely filled with bubbles. The more I unscrew the nozzles the more dense the bubbles in the body get. Take the nozzle off completely and WATCH OUT! With my nozzle completely off, the skimmer body looks like the pic that moonpod posted. But if it is on, even if it is uscrewed almost completely, the bubble density doesn't come close.
My skimmer came with 3 POM NW's, no titanium NW's. Each POM NW, is a different size.